An Analysis of the Total Syntheses of Aphidicolin
|
|
- Merryl Jennings
- 6 years ago
- Views:
Transcription
1 An Analysis of the Total Syntheses of Aphidicolin An Evans Group Afternoon Seminar Krista Beaver March 20, 1998 A B D C Aphidicolin Isolated from the fungus Cephalosporium aphidicola (esp, Chem. Comm.1972, 1027) Structure determined by X-ray crystallography and chemical degradation Demonstrated activity against DNA viruses and human and murine neoplastic cell lines; acts via inhibition of DNA polymerase α (Cell 1981, 23, 647) Proposed Biosynthesis PP PP + PP Aphidicolin anson, JCS Perkins I1988, 1477 andout 01 3/23/98 11:02 AM
2 Endgame Strategies - An Early Approach 3 S + I -, Na 1. K, 2 2. acetone, + Cl, 74% + 42% 28% esp, JCS Perkins I 1973, 284 Endgame Strategies - An Improvement C 2 1. Tf 2, di-t-butyl-4-methylpyridine (100%) 2. Pd 0, C, (75%) m-cpba (90%) C 2 1. LA, TF, reflux (100%) 2. ion exchange resin,, reflux (100%) andout 02 3/20/98 11:06 AM verall yield was improved to 67% from 31% A. B. Smith III, JCS Perkins I 1991, 969
3 McMurry - Retrosynthetic Analysis McMurry Synthesis - A Robinson Annulation (C 2 ) 2 p-ts (80%) 1. Li, N 3, then TMS-Cl, Et 3 N (97%) 2. C 3 Li, then C 2 1. L-Selectride 2. acetone, p-ts (85%) Na, trace t-amyl alcohol (95%) 1. LDA, then methallyl iodide (89%) 2. s 4, NaI 4 dioxane/ 2 (86%) J. E. McMurry JACS 1979, 1330 andout 03 3/20/98 2:14 PM
4 McMurry - Completion of the Synthesis 1. LA (95%) 2. EtC=C 2 g(ac) 2 (90%) 360 C (20%) C LA, then p-tscl, pyridine (60%) Ts Aphidicolin Na 2 Fe(C) 4 NMP (30%) J. E. McMurry JACS 1979, 1330 Trost - Retrosynthetic Analysis TMS TMS andout 04 3/20/98 11:10 AM
5 Trost - A Vinyl Cyclopropane Rearrangement 1. SPh 2 2. PhSeSePh, NaB 4 3. C 3 (TMS)C=NTMS (50%) TMS FVP, 610 C (97%) TMS 8 1. Pd(Ac) 2, (73%) 2. Li, N 3,, then TMS-Cl (82%) TMS 8 2:1 Diastereoselection (α:β at C8) Trost, JACS 1979, 1328 Trost - Completion of the Synthesis TMS n-buli, MPA, then allyl iodide (35%) 1. thexyl borane then Na, 2 2 (57%) 2. PCC, then K, (54%) PCC (87%) 1. DP, p-ts 2. 2 NN 2, K, 140 C (91%) 3. p-ts, acetone (78%) andout 05 3/20/98 11:11 AM Trost, JACS 1979, 1328
6 Bettolo and Lupi - Retrosynthetic Analysis Bn Bn Bn Bn Bn Bn Bettolo and Lupi - [2+2] Cycloaddition 1. Na, BnBr 2. +, 2 (90%) 3. C 2 Et, Na Bn Bn MVK (75%) Et 3 N Bn Bn allene, hv (86%) Bn Bn 1. Na, CS 2, I (72%) 2. NaB 4 (91%) C (90%) Bn Bn 1. C 2 C 2, p-ts (80%) NaB 4 4. Cl 5. Na (76%) Bn Bn andout 06 3/20/98 11:13 AM Bettolo, Lupi, CA 1982, 371 Bettolo, Lupi, CA 1983, 1922 Bettolo, Lupi, CA 1988, 872
7 Bettolo and Lupi - Completion of the Synthesis Bn Bn MsCl, NaC 3 (97%) Bn Bn 1. PCC (81%) 2. Li/N 3 (69%) Corey's Intermediate Bettolo, Lupi, CA 1982, 371 Bettolo, Lupi, CA 1983, 1922 Bettolo, Lupi, CA 1988, 872 van Tamelen - Retrosynthetic Analysis Ms C 3 C 3 C 3 Bn andout 07 3/20/98 11:14 AM
8 van Tamelen - A Biogenetic Approach C 3 C 3 C 3 NBS, then K 2 C 3, (33%) 1. LiNEt 2 (57%) 2. V(acac) 2, 3. BnI, Na (90%) Bn FeCl 3 C 3 1. TrisNN 2, p-ts (70%) 2. n-buli, TMEDA (82%) 1. Li, TF-Et 2. Cl-Et 3. p-ts, acetone (55%) Bn van Tamelen, JACS 1983, 142 Van Tamelen - Completion of the Synthesis benzene, reflux, (86%) 1. Pt black (90%) 2. Pb(Ac) 2, 2, pyridine (28%) Ms 1. CaC 3, 2 -acetone (60%) 2. Cr 3 -pyr (90%) 1. m-cpba, (100%) 2. Na, benzene (20%) 3. MsCl andout 08 3/20/98 11:15 AM van Tamelen, JACS 1983, 142
9 Tanis - Retrosynthetic Analysis Bn Bn Tanis - Cationic Cyclization 1. PhCCl 2. Se 2, TBP (70%) Ac 1. (L) - DIPT, Ti(iPr) 4 TBP (83%, >95%ee) 2. BnBr, Na (88%) 3. Na, (99%) 4. n-buli, TsCl, LiCl (85%) BF 3 Et 2 Et 3 N, -78 C (72%) MgCl LiCuCl 4 (79%) Bn Cl Bn Bn andout 09 3/20/98 11:16 AM Tanis, Chuang, ead JC 1988, 4929 Tanis, Chuang, ead TL 1985, 6147
10 Tanis - Completion of the Synthesis Bn 1. Swern (97%) 2. MgBr 2, then L-Selectride (95%) Bn Diastereoselection 8.5:1 1. LA (89%) 2. acetone, + (93%) 1. NBS, DMF 2. i. n-buli ii. I (65%) 2 / Pd-C 96% m-cpba 97% McMurry's Intermediate Tanis, Chuang, ead JC 1988, 4929 Tanis, Chuang, ead TL 1985, 6147 Corey - Retrosynthetic Analysis TBS C 2 P(Et) 2 C 2 TBS TBS andout 10 3/20/98 11:17 AM
11 Corey - Total Synthesis Ac 1. Se 2, Et 2. NaB 4 (61%) Ac 1. TBS-Cl, Et 3 N, DMAP 2. K 2 C 3, (90%, 2 steps) 3. MsCl, Et 3 N 4. LiBr, TF TBS Br (90%, 3 steps) Clg TBS C 2 1. g(ccf 3 ) N 2 2. NaCl, 2 (60%) TBS C 2 P(Et) 2 Na, (Et) 2 PCl TBS C 2 Corey, JACS 1980, 1742 Tius, Ph.D. Thesis, arvard Corey - Elaboration of the Bicycle C 2 1. C 2 C 2, p-ts, Ph (90%) C 2 1. TBAF 2. L-Selectride C 2 Clg 2. NaB 4, DMF, 2 3. PDC, C 2 Cl 2 3. C, p-ts (58%) TBS TBS 1. LA 2. PCC 3. Cl 4 (90%) andout 11 3/20/98 11:19 AM S S TMS C 1. TMSS(C 2 ) 3 STMS ZnI 2, CCl 3 (88%) 2. TMSCN, ZnI 2 (97%) 3. DIBAL- (75%) 1. MVK, DBU, K 2 C 3 TF/ 2. pyrrolidine/ac C Corey, JACS 1980, 1742 Tius, Ph.D. Thesis, arvard
12 Corey - Construction of the C/D Ring System S S TMS 1. LiSi 3, MPA 2. LDA, MPA, then 2, Ac (64%, 2 steps) S S C C 1. NaB 4 (100%) 2. TBSCl, DMAP Et 3 N 3. IN NI 4. 2, Pd/C 1. TBAF 2. TsCl, DMAP, Et 3 N (70%, 5 steps) 3. LiN() 2, -120 (90%) TBS Corey, JACS 1980, 1742 Tius, Ph.D. Thesis, arvard Corey - Completion of the Synthesis 1. Cl 4 (76%) 2. Li Et 3. Ac, 1:1 Diastereoselection 1. (49%) 2. 1N Cl (74%) Corey, JACS 1980, 1742 Tius, Ph.D. Thesis, arvard andout 12 3/20/98 11:21 AM
13 Ireland - Retrosynthetic Analysis C 2 TMS TMS N 2 Ireland - Synthesis of 'omo-wieland Mischer Ketone' 1. Na/N 3 (52%) 1. KN 2, then I (100%) 2. Al(i-Pr) 3 2. Li (100%) 1. oxalic acid, 2 (90%) 2. Li/N 3 (85%) 35% 1. C 2 C 2 p-ts (85%) I 2, 130 C 2. 2, hematoporphyrin 2Cl pyr, hv, then Ac 2 (100%) 57:43 52% andout 13 3/20/98 11:23 AM Ireland, JACS, 1981, 2446 Ireland, JC, 1984, 1001 Ireland, JC, 1979, 4323 Ireland, JC, 1979, 4318
14 Ireland - etero-diels Alder Reaction C 2 Si(C 3 ) 3 R TMS 125 C (69%) DIBAL Ph 3 P=C 2 (95%) R = C 2 R = C R = C=C C sealed tube (84%) TMS TMS N 2 1. n-buli, i-amn (85% borsm) 2. N 2 Cl Ireland, JACS, 1981, 2446 Ireland, JC, 1984, 1001 Ireland - the Rearrangement TMS TMS hv, NaC 3, C 3 N 2 TMS E Si 2 (60%) TMS [2 +2] andout 14 3/20/98 11:24 AM Ireland, JACS, 1981, 2446 Ireland, JC, 1984, 1001
15 Ireland - Further Elaboration 1. DIBAL- (99%) 2. TBSCl, Imid (95%) 1. s 4, pyr 2. DMP, p-ts 3. TBAF, TF (92%) TBS 1. n-buli, TMEDA 2 NPCl 2 2. N 2, Li, (86%) PPTS, acetone (95%) Ireland, JACS, 1981, 2446 Ireland, JC, 1984, 1001 Ireland - Completion of the Synthesis 1. K, TF; TMS-Cl, Et 3 N 2. Pd(Ac) 2 (90%, 2 steps) (C 2 ) x, PhS Et 3 N, Et (78%) PhS Li, N 3, -TF Et 3 N, TMS-Cl, TF (90%) andout 15 3/20/98 11:25 AM L-Selectride, TF, then Cl/ (60%, 2 steps) Li, TF, C TMS Ireland, JACS, 1981, 2446 Ireland, JC, 1984, 1001
16 Iwata - Retrosynthetic Analysis MM C 2 Iwata - Sucessive Alkylations C 2 C 2 s-bu 1. I, K 2 C 3 (100%) 2. Na, () 2 C 3. Cl, Pd/C (98%) 1. Br/Ac (100%) 2. sec-bubr, DBU (72%) 3. Rh/Al 2 3 (99%) 1. TBSCl, imid (95%) 2. LA (98%) 3. PCC, NaAc (91%) MM 1. Br 2, MPA (85%) 2. TsCl, pyridine (75%) 3. LiBr (98%) 4. K (99%) MM 1. C 2 =CMgBr (83%) 2. MM-Cl, DIEA (77%) 3. B 3 -TF, 2 2 (83%) 4. TBAF (99%) TBS C Iwata, Chem. Pharm. Bull., 1994, 1756 Iwata, Chem. Pharm. Bull., 1995, 193 Iwata, Chem. Pharm. Bull., 1985, 944 Iwata, Chem. Pharm. Bull., 1993, 1900 andout 16 3/20/98 11:26 AM
17 Iwata - Completion of the Synthesis MM MM MM 1. LDA, TF, then PhSeBr, 2 2, (61%) 2. TP(C 2 ) 4 Cl, Li, 1,2-dibromoethane (98%) 1. PCC (81%) 2. LiCu 2 (67%) TP TP 1. acetone, Cl (97%) 2. Swern (76%) 3. p-ts, Ph, (89%) 1. 3,5-dimethylpyrazole Cr 3 (75%) 2. Pd(PPh 3 ) 4, n-bu 3 P, CN, CN 4 (80%) 1. C 2 C 2, p-ts (75%) 2. LA (96%) 3. Ac 2, DMAP (94%) Ac elaborated to Aphidicolin by the methods of Ireland and Smith Iwata, Chem. Pharm. Bull., 1994, 1756 Iwata, Chem. Pharm. Bull., 1995, 193 Iwata, Chem. Pharm. Bull., 1985, 944 Iwata, Chem. Pharm. Bull., 1993, 1900 Fukumoto - Retrosynthetic Analysis Br andout 17 3/20/98 11:28 AM
18 Fukumoto - The eck Reaction LDA, TF Bromoacrolein (89%) Br 1. Pd(Ac) 2, P-(o-Tolyl) 3 K 2 C 3, CN, (90%) 2. C 2 C 2, PPTS (89%) 1. C 2 =CEt, g(tfa) 2 2. Toluene,, then NaB 4 (82%) Diastereoselection 3:1 1. 2, PdCl 2, CuCl (70%) 2. 2, Pd-C (82%) 3. Ph 3 P=C 2 (81%) 1. methylene blue, 230 C 2. 2, hv, porphyrin, pyr 3. NaI, Ac 4. Mn 2 (82%) 1. PCC, NaAc (92%) 2. Ph 2 P()C 2 C 2 =C 2 n-buli, MPA Iwata's Intermediate Fukumoto Tet, Fukumoto, Tet, 10183, 1994 Fukumoto, TL, 6495, 1994 olton - Retrosynthetic Analysis TBS C TBS R TBS Li Tol S TBS S Tol andout 18 3/20/98 11:29 AM
19 olton - EnantioselectiveTotal Synthesis TBS Li Tol S TBS S Tol Li TBS S Tol Diastereoselection 7.4:1 (75%) 1. Vinyllithium 2. F/ (76%) C TBS 1. PPTS/2-ethoxydioxylane (89%) 2. 3, DMS 3. LA 4. TBS-Cl, DMAP 5. Cr 3, pyridine (65%) R Na/ (100%) S Tol Zn/N 4 Cl (94%) R = S()Tol R = olton, JACS, 1987, 1597 olton - Completion of the Synthesis C TBS 1. KtBu, 0 C 2. 2, Pd/C, NaEt 3. C 2 C 2 PPTS (90%) TBS 1. Li, N 3, C 2 2. L-Selectride TBS C, p-ts, F 85% TBS Corey's Intermediate andout 19 3/20/98 11:31 AM olton, JACS, 1597, 1987
20 The Final Tally Longest Linear Sequence verall Yield McMurry Trost van Tamelen Bettolo/Lupi Ireland Corey Tanis Iwata Fukumoto olton 18 steps 23 steps 25 steps 24 steps 28 steps 37 steps 27 steps 40 steps 25 steps 28 steps 0.9% yield 0.6% yield 0.03% yield 2.9% yield 0.93% yield 0.96% yield 2% yield 0.19% yield 2.3% yield 1.65% yield andout 20 3/20/98 2:14 PM
Comparative Synthesis of Ingenol. Tyler W. Wilson SED Group Meeting
Comparative Synthesis of Ingenol Tyler W. Wilson SED Group eting 2.27.07 Ingenol: Biology, Isolation, and istory During WWII a latex was manufactured by precipitating the milky juice of the Euphorbia Ingen
More informationSECTION 12. «POT-POURRI» in Organic Synthesis (2018)
SECTIN 12 «PT-PURRI» in rganic Synthesis (2018) 1 Total Synthesis of Erythromycin A via a Spiroketal ERYTRMYCIN A DESLNGCAMPS et al. Can. J. Chem. 1985, 63, 2810-2820. 2 Tetrahydropyran Derivative as Starting
More informationTotal Synthesis towards Maoecrystal V
Total Synthesis towards Maoecrystal V isolated from the leaves of a Chinese medicinal herb, Isodon eriocalyx in 2004. structure was determined by comprehensive NMR and MS spectroscopic analysis and confirmed
More informationTotal Synthesis of the Proposed Structure of Briarellin J
Total Synthesis of the Proposed Structure of Briarellin J Michael T. Crimmins, Mark C. Mans, and Abimael D. Rodríguez. rg. Lett. 2010, ASAP Ac Ac originally proposed structure revised structure Eric E.
More informationApproaches to the Synthesis. of Tetrahydropyrans. (and closely related heterocycles)
Approaches to the Synthesis of Tetrahydropyrans (and closely related heterocycles) William Morris Literature Presentation July 6, 2004 I. Intro A Nomenclature B Prevalence in Nature C Biosynthetic Considerations
More informationCEM 852 Final Exam. May 6, 2010
CEM 852 Final Exam May 6, 2010 This exam consists of 7 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 150. n answering your questions,
More informationJOC Year-in-Review, 1984
Baran Lab Group eting JC Year-in-eview, 198 Y oshihiro Ishihara Statistics for J. rg. Chem. 198, Volume 9, Issues 1-26: 1313 Papers 1 erbert C. Brown 8 Albert Padwa 8 Leo A. Paquette 7 Dale L. Boger 7
More informationSynthesis of Azadirachtin: A Long but Successful Journey
ynthesis of Azadirachtin: A Long but uccessful Journey Gemma E. Veitch, Edith Beckmann, Brenda J. Burke, Alistair Boyer, arah L. Maslen, and teven V. Ley Angew. Chem. Int. Ed. 2007, Early View And Gemma
More informationJOC: 1985 Year in Review
Baran Group eting JC: 1985 Year in eview Syntheses discussed: thodoligies discussed: Quadrone 2 C (+)-irsutic Acid C (±) Coriolin (!)-Longifolene (!)-astanecine Manganese (III)-mediated "-lactone annulation
More informationNine-Step Enantioselective Total Synthesis of (+)-Minfiensine
ine-step nantioselective Total Synthesis of (+)-Minfiensine Jones, S. B.; Simmons, B.; MacMillan, D. W. C.* J. Am. Chem. Soc. 2009, ASAP. DI: 10.1021/ja906472m Kara George Wipf Group - Current Literature
More informationTotal Syntheses of Minfiensine
Total Syntheses of Minfiensine Douany, A. B.; umphreys, P. G.; verman, L. E.*; Wrobelski, A. D., J. Am. Chem. Soc. 2008, ASAP. D: 10.1021/ja800163v Shen, L.; Zhang, M.; Wu, Y.; Qin, Y.*, Angew. Chem. nt.
More informationJACS 1982: A Survey of Papers with a Focus on Synthetic Organic Chemistry
JAC 1982: A urvey of Papers with a Focus on ynthetic rganic Chemistry Baran Lab Group eting 15 ctober 2003 Carlos A. Guerrero eagents and thods 1 2 [] 2 2 1 1 PhC, Et 3 2 [] 2 1 2 1 By 1982, the [3 + 2]
More informationTowards Maoecrystal V: A Comparison of Recent Strategies
Towards Maoecrystal V: A Comparison of Recent Strategies Reactant/Reagent Current Literature: November 14, 2009 lissa Sprachman lissa Sprachman @ Wipf Group Page 1 of 14 12/28/2009 Maoecrystal V: Structural
More informationThe Vetivane Sesquiterpenes
Group eting In 1940, Pfau and Plattner proposed structures for b-vetivone, one of the constituents of vetiver oil, an aromatic oil from vetiver grass. The structure was assigned based on extensive degradative
More informationStudies Toward the Total Synthesis of (±)-Noelaquinone
Research Topic Seminar 18 June 2005 Studies Toward the Total Synthesis of (±)-Noelaquinone David Amantini WIPF GRUP The Role of Natural Products in Drug Discovery For thousands of years medicine and natural
More informationSyntheses of Leucascandrolide A. Supergroup Meeting August 4 th, 2004 Yu Yuan
Syntheses of Leucascandrolide A Supergroup Meeting August 4 th, 2004 Yu Yuan Leucascandrolide A Me Me Me Dambrosio, M.; Guerriero, A.; Debitus, C.; Pietra, F. elvetica Chimica Acta 1996, 79, 51-60 Me 1
More informationEnan$oselec$ve Total Synthesis of Amphidinolide F
Enan$oselec$ve Total Synthesis of Amphidinolide F Subham Mahapatra and ich G. Carter regon State University Angew. Chem. nt. Ed., 2012, 51, 7948 Nicolas Millius Bern, 07.02.2013 ntroduc$on isolated from
More informationTotal Syntheses of Nominine
Total Syntheses of ominine i Literature t Group eting Lizzie Bryan ctober 17, 2007 Aconite Alkaloids Atidane V eatchane Cycloveatchane Aconitane etisan Muratake,. M.; atsume, M.; akai,. Tetrahedron, 2006,
More informationSynthetic Developments Towards the Preparation of Erythromycin and Erythronolide Derivatives
ynthetic Developments Towards the Preparation of Erythromycin and Erythronolide Derivatives Russell C. mith Denmark Group Meeting 8-9-2005 most extensive project in organic synthesis this phenomenon is
More informationo-palladated cat. [Chem. Comm (1999)] [Org. Lett. 2, 1826 (2000)] [Org. Lett. 2, 2881 (2000)] [JACS 41, 9550 (1999)]
3. Boron -- eview [Suzuki Chem. ev. 95, 2457 (1995)] U77b ydroboration also attractive but B Pd transmetallation difficult - must produce stable B product - solved (by Suzuki) by adding base to make Borates
More informationSynthesis of Amphidinolide X and an Exploration of Key Reactions
PJM 1/12/05 Synthesis of Amphidinolide X and an Exploration of Key eactions Lepage,.; Kattnig, E.; Furstner, A. JACS, 2004, 126, 15970-15971. 7 13 1 6 19 - Produced by marine dinoflagellates, Amphidinium
More informationTotal Synthesis of (+)-Sieboldine A J. Am. Chem. Soc. 2010, 132,
Total Synthesis of (+)-Sieboldine A J. Am. Chem. Soc. 2010, 132, 7876 7877. Current Literature Presentation 10JUL2010 Michael Yang Mike Yang @ Wipf Group Page 1 of 15 7/10/2010 Sieboldine A Background
More informationA Concise Synthesis of ( )- Aplyviolene Facilitated by a Stragetegic Ter<ary Radical Conjugate Addi<on
A Concise Synthesis of ( )- Aplyviolene Facilitated by a Stragetegic Ter
More informationHennoxazole A. Philip Williams Group Meeting December 12, OMe. OMe 1 6 O H
ennoxazole A 1 6 11 17 24 Philip Williams Group eting December 12, 2007 Discovered Discovered by Paul cheuer at the University of awaii in 1991. Isolated 480mg ennoxazole A from 4.5kg from the sponge Polyfibrospongia
More informationJOC YEAR IN REVIEW 1972
JC YEAR IN REVIEW 1972 ALEXANDRS ZGRAFS TE BARAN GRUP MEETING 08/20/2003 The difficult decision Some statistics!number of articles 1225!!Full articles 480!More than 25 total synthesis!isolation and characterization
More informationVINBLASTINE. H MeO 2 C MeO. OAc. CO 2 Me. Me H
VIBLATIE 2 C 1 C 2 Ac a 3: catharanthine C 2 Ac C 2 2: ( )-vindoline xidation 5' 2 C 3' 16' 20' Ac C 2 1: (+)-vinblastine b 4 C 2 TFAA, -50 C Polonovski fragmentation 6' 5' 16' C 2 5 TFA 4' 3' 15' 16'
More informationStrategies for Stereocontrolled Synthesis
Chemistry. Synthetic rganic Chemistry II Lecture 3 March, 2007 Rick L. Danheiser Massachusetts Institute of Technology! Thermodynamic Control Strategies! Kinetic Control Strategies! Strategies for the
More informationHighly Cytotoxic, Structure Similar Polyke>des CO 2 H
Current Literature Anguinomycins and Deriva2ves: Total Syntheses, Modeling, and Biological Evalua2on of the Inhibi2on of Nucleocytoplasmic Transport liv Eidam, Ulrike Kutay, Karl Gadermann, et al, JACS,
More informationReporter: Yue Ji. Date: 2016/12/26
Literature Report (11) Total Synthesis of Rubriflordilactone B Reporter: Yue Ji Checker: Mu-Wang Chen Date: 2016/12/26 Yang, P.; Yao, M.; Li, J.; Li, Y.; Li, A.* Angew. Chem. Int. Ed. 2016, 55, 6964. Laboratory
More informationApproaches to the Synthesis of Macquarimicins and Cochleamycins
Ac Macquarimicin A Cochleamycin A Approaches to the Synthesis of Macquarimicins and Cochleamycins Drew Adams Friday Seminar March 18, 2005 Isolation and Activity Ac Isolated in 1995 from Micromonospora
More informationSupporting Information. The synthesis of cardenolide and bufadienolide aglycones, and related steroids bearing a. heterocyclic subunit
Electronic upplementary Material (EI) for Natural Product eports. This journal is The oyal ociety of Chemistry 2017 upporting Information The synthesis of cardenolide and bufadienolide aglycones, and related
More information(please print and circle your last name) CHEMISTRY 332 FINAL EXAM. December 11, 2006
Seat No. Name (please print and circle your last name) CEMISTRY 332 FINAL EXAM December 11, 2006 I. (18 points) II. III. IV. (48 points) (50 points) (40 points) V. (26 points) VI. (18 points) TTAL (200
More informationRadical Reactions. Radical Stability!!! bond dissociation energies X Y X + Y. bond BDE (kcal/mol) bond BDE (kcal/mol) CH 3 CH 3 CH 2 95 O H R 2 C H
adical eactions adical Stability!!! bond dissociation energies X Y X Y bond BDE (kcal/mol) bond BDE (kcal/mol) C 3 104 108 C 3 C 2 98 110 95 2 C 102 (-) 93 (C-) 92 C 3 C 3 36 89 85 C 3 C 3 80 adical eactions
More informationStudies toward the Synthesis of Azadirachtin: Total Synthesis of a Fully Functionalized ABC Framework and Coupling with a Norbornene Domain
Studies toward the Synthesis of Azadirachtin: Total Synthesis of a Fully Functionalized ABC Framework and Coupling with a Norbornene Domain Nicolaou and Co-workers Angew. Chem. Int. Ed. 2005, 44, 3443
More informationChem 242b Chemical Synthesis
Lecture 7 [2+2] Cycloaddition Strategies 7A. verview of Ketene Cycloaddition Strategies (andout 4) If you need a cyclobutanone and desire to make it by [2+2] addition of ketene to an olefin, you will always
More informationSynthesis of Substituted 1,4-Dienes by Direct Alkylation of Allylic Alcohols Kolundzic, F.; Micalizio, G. C. J. Am. Chem. Soc. 2007, 129,
Synthesis of Substituted 1,4-Dienes by Direct Alkylation of Allylic Alcohols Kolundzic, F.; Micalizio, G. C. J. Am. Chem. Soc. 2007, 129, 15112-15113. Total Synthesis and Structure Elucidation of (+)-orbasin
More informationProgress toward the Total Synthesis of Pleurotin
Progress toward the Total Synthesis of Pleurotin SINYA IIMURA Wipf Research Group Meeting July 9th, 2005 Shinya Iimura @ Wipf Group 1 7/10/2005 Presentation utline! Isolation and Structure! Biological
More informationConvergent Route to ent-kaurane Diterpenoids: Total Synthesis of Lungshengenin D and 1α6α- Diacetoxy-ent-kaura-9(11),16-dien- 12,15-dione
Convergent Route to ent-kaurane Diterpenoids: Total Synthesis of Lungshengenin D and 1α6α- Diacetoxy-ent-kaura-9(11),16-dien- 12,15-dione Xiangbo Zhao, Wu Li, Junjie Wang, and Dawei Ma* Shanghai Institute
More informationStemona Alkaloids. tuberostemonol. OMe O O. neostemonine. OMe O O. protostemonine
I. Introduction 9 9a 8 1 2 The Stemonaceae plant family, which comprises over 0 species, produces a large class of structurally diverse alkaloids featuring a conserved pyrrolo [1,2-a] azepine = perhydroazaazulene
More informationJames D. White. A very productive professor 64 students graduated from his lab 94 postdocs have worked in his lab. Education Experience
A very productive professor 64 students graduated from his lab 94 postdocs have worked in his lab Education Experience Fraser Fleming University of Drexel Pavel agory University of Michigan Cambridge University,
More informationBaran Group Meeting 04/07/04 The Total Synthesis of (+)-Ryanodol
Baran Group eting 04/07/04 The Total Synthesis of ()-Ryanodol A. Bélanger; D. Berney;. Borschber; R. Brousseau; A. Doutheau; R. Durand;. Katayama; R. Lapalme; D. Leturc; C. Liao; F. MacLachlan; J. Maffrand;
More informationOnly five of the molecules below may be prepared as the sole product of allylic halogenation of the respective alkene. Circle those five.
Chem 232 D. J. Wardrop wardropd@uic.edu Problem Set 6 Answers Question 1. nly five of the molecules below may be prepared as the sole product of allylic halogenation of the respective alkene. Circle those
More informationMassachusetts Institute of Technology Organic Chemistry 5.512
Massachusetts Institute of Technology rganic Chemistry 5.512 Problem Set 6 Solutions Stereocontrolled Carbonyl Reduction and Aldol Reactions May 5, 2006 Lucy Kohnen ( The target compound was used as an
More informationChapter 4 Electrophilic Addition to Carbon Carbon Multiple Bonds 1. Addition of H X 2. Addition of H OH and addition of Y X 3. Addition to allene and
Chapter 4 Electrophilic Addition to Carbon Carbon Multiple Bonds 1. Addition of X 2. Addition of and addition of Y X 3. Addition to allene and alkyne 4. Substitution at α-carbon 5. eactions via organoborane
More informationTotal Synthesis of (+/-)-Goniomitine via a Formal Nitrile/Donor-Acceptor Cyclopropane [3 + 2] Cyclization
Total Synthesis of (+/-)-Goniomitine via a Formal itrile/donor-acceptor Cyclopropane [3 + 2] Cyclization (-)-Goniomitine Christian L. Morales and Brian Pagenkopf* rganic Letters, ASAP Current Literature
More informationChapter 5 Three and Four-Membered Ring Systems
Chapter 5 Three and Four-mbered ing ystems 5.1 Aziridines Aziridines are good alkylating agents because of their tendency to undergo ring-opening reaction with nucleophiles 例 mitomycin C antibiotic and
More informationChemistry 206. Advanced Organic Chemistry. Intramolecular Enone-Olefin Photocycloadditions Directed Toward Natural Product Synthesis
Chemistry 206 Advanced rganic Chemistry andout 36A Intramolecular Enone-lefin Photocycloadditions Directed Toward atural Product Synthesis Travis Dunn Evans Group Seminar, March 31, 2000 DAE Group Friday
More informationCHEM 330. Final Exam December 5, 2014 ANSWERS. This a closed-notes, closed-book exam. The use of molecular models is allowed
CEM 330 Final Exam December 5, 2014 Your name: ASWERS This a closed-notes, closed-book exam The use of molecular models is allowed This exam consists of 12 pages Time: 2h 30 min 1. / 30 2. / 30 3. / 30
More informationTotal Synthesis of Oxazolomycin A
Total Synthesis of xazolomycin A Me xazolomycin A Me Eto, K.; Yoshino, M.; Takahashi K.; Ishihara, J.; atakeyama S. rg. Lett. 2011, 13, 5398 Dimas Paz Wipf group- Current Literature ctober 8, 2011 Dimas
More informationCEM 852 Final Exam. May 5, 2011
CEM 852 Final Exam May 5, 2011 This exam consists of 8 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 150. In answering your questions,
More informationHigher Order Cycloadditions in Synthesis
'Malley igher rder Cycloadditions in Synthesis otes on Mechanism The cyclodimerization of alkenes and alkynes is a fundamental transition metal mediated process. This is the basic step in the mechanism
More informationI. Liu Lab. Ka<e Boknevitz 1
A ighly Convergent Total Synthesis of Leustroducsin B Barry M. Trost,* Berenger Biannic, Cheyenne S. Brindle, B. Michael Keefe, Thomas J. unger, and Ming-Yu gai Department of Chemistry, Stanford University,
More informationTotal Synthesis of Callipeltoside A. Denmark Group Meeting Aaron Bailey September 23, 2008
Total Synthesis of Callipeltoside A Denmark Group eting Aaron Bailey September 23, 2008 Callipeltoside A First isolated from Lithistid sponge in 1996 Exhibits moderate cytotoxicity against human bronchopulmonary
More informationReady; Catalysis Conjugate Addition
eady; Catalysis Conjugate Addition Topics covered 1. 1,4 addition involving copper a. stoichiometric reactions b. catalytic reactions c. allylic substitution. Conjugate addition without copper a. Ni-based
More informationA Review of Total Synthesis of Spirotryprostatin A and B. Jinglong Chen Supergroup meeting Princeton University June
A Review of Total Synthesis of Spirotryprostatin A and B Jinglong Chen Supergroup meeting Princeton University June 28 2006 ovel Mammalian Cell Cycle Inhibitors, Spirotryprostatins A and B Me Spirotryprostatin
More informationCEM 852 Exam-2 April 11, 2015
CEM 852 Exam-2 April 11, 2015 This exam consists of 6 pages. Please make certain that your exam has all of the necessary pages. Total points possible for this exam are 100. In answering your questions,
More informationSynthetic Efforts Toward Palau'amine
ynthetic Efforts Toward Palau'amine Doug Behenna, Ryan McFadden Eric Ashley, Jenn tockdill Akihiko Iwashita August 9, 2004 2 2 2 Isolation of Palau'amine and Congeners R 2 R 1 R 1 R 2 2 2 2 2 2 2 R 1 =
More informationCHEM 203. Final Exam December 15, 2010 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Final Exam December 15, 2010 Your name: ANSWERS This a closed-notes, closed-book exam You may use your set of molecular models This test contains 15 pages Time: 2h 30 min 1. / 16 2. / 15 3. / 24
More informationAdditions to Metal-Alkene and -Alkyne Complexes
Additions to tal-alkene and -Alkyne Complexes ecal that alkenes, alkynes and other π-systems can be excellent ligands for transition metals. As a consequence of this binding, the nature of the π-system
More informationTotal Synthesis of (-)-Anominine
Total Synthesis of (-)-Anominine Ben Bradshaw, Gorka Etxbarria-Jardí and Josep Bonjoch* Laboratori de Química rgànica, Facultat de Farmàci, Universitat de Barcelona, Barcelona, Spain J. Am. Chem. Soc.
More informationCase study #1: Strychnine
Case study #1: Strychnine STRYCIE ature Chemistry 2009, 1, 193-205 Synthesis of Biotin - ~without- Protecting Groups ClS 2 C Et 2, -60 o C Cl 2 S A Et 3 + 3 _ C 2 Cl 2, -20 o C 3 2 S B 3 Curtius rearrangement
More informationTotal Synthesis of (+)-Suaveolindole
1 Total Synthesis of (+)-Suaveolindole 15 2 C 16 11 Emile J. Velthuisen and Samuel J. Danishefsky J. Am. Chem. Soc. 2007, 9, 10640-10641 Julia Vargas September 15, 2007 2 utline Isolation and Elucidation
More informationCHEM 203. Final Exam December 18, 2013 ANSWERS. This a closed-notes, closed-book exam. You may use your set of molecular models
CEM 203 Your name: Final Exam December 18, 2013 ANSWERS This a closed-notes, closed-book exam You may use your set of molecular models This test consists of 10 pages Time: 2h 30 min 1. / 20 2. / 20 3.
More informationOChem2 Course Pack. Practice Problems by Chapter. Practice Exams
Chem2 Course Pack Practice Problems by Chapter Practice Exams Chemistry 3720 Problem Sets Chemistry 3720 Ch. 13-19 Synthesis Problems These problems are typical of those that will be on the upcoming exams
More informationCHEM 330. Final Exam December 11, This a closed-notes, closed-book exam. The use of molecular models is allowed. This exam contains 12 pages
CEM 330 Final Exam December 11, 2007 Your name: This a closed-notes, closed-book exam The use of molecular models is allowed This exam contains 12 pages Time: 2h 30 min 1. / 20 2. / 20 3. / 30 4. / 40
More informationTotal Synthesis of (-)-Mersicarpine
Total Synthesis of (-)-Mersicarpine Rie akajima, Tsuyoshi gino, Satoshi Yokoshima, and Tohru Fukuyama. J. Am. Chem. Soc. ASAP Published online 1-7-2010 Eric E. Buck Current Literature January 23, 2010
More informationtransmetallate displace ox. add. M + (insert) (β-elim.)
Chapter IV. Transition Metal σ-alkyl Complexes I. General For much of the rest of this course it will be necessary to understand how σ-alkyl metal complexes are formed and how they react. This is summarized
More informationTotal Synthesis of Peloruside A Through Kinetic Lactonization and Relay Ring-Closing Metathesis Cyclization Reactions
Total Synthesis of Peloruside A Through Kinetic Lactonization and Relay Ring-Closing Metathesis Cyclization Reactions Thomas R. oye, Junha Jeon, Lucas C. Kopel, Troy D. Ryba, Manomi A. Tennakoon, and Yini
More informationTotal Synthesis of the Sesquiterpenoid Periconianone A Based on a Postulated Biogenesis
Total Synthesis of the Sesquiterpenoid Periconianone A Based on a Postulated Biogenesis C 3 C3 Liffert, R., Linden, A., Gademann, K. J. Am. Chem. Soc. 2017, 139, 16096 Presented by: Brendyn Smith CEM 852
More informationLiterature Report 3. Rapid Syntheses of (+)-Limaspermidine and (+)-Kopsihainanine A. Date :
Literature Report 3 Rapid Syntheses of (+)-Limaspermidine and (+)-Kopsihainanine A Reporter : Xiao-Yong Zhai Checker : Shubo u Date : 2017-10-30 Pritchett, B. P.; Donckele, E. J.; Stoltz, B. M. Angew.
More informationEnantioselective Total Synthesis of (-)-Acetylaranotin, a Dihydrooxepine Epidithiodiketopiperazine
Enantioselective Total Synthesis of (-)-Acetylaranotin, a Dihydrooxepine Epidithiodiketopiperazine Julian A. Codelli, Angela L. A. Puchlopek, and Sarah E. Reisman* JACS. ASAP. ct. 24, 2011 DI: 10.1021/ja209354e
More information2.222 Practice Problems 2003
2.222 Practice Problems 2003 Set #1 1. Provide the missing starting compound(s), reagent/solvent, or product to correctly complete each of the following. Most people in the class have not done this type
More informationIsao Kuwajima. Supervised Work (Corey) Born Nov BS (Tokyo Institute of Technology) LiCuBu 2 C 7H15 OH
Yuzuru Kanda Baran lab Group eting Biography Supervised Work (Corey) - 1937 Born ov 11 I - 1961 BS (Tokyo Institute of Technology) CuBu 2 under T. Mukaiyama C 715-1966.D in chemisty (in the same lab) ex/
More informationTips for taking exams in 852
Comprehensive Tactical Methods in rganic Synthesis W. D. Wulff 1) Know the relative reactivity of carbonyl compounds Tips for taking exams in 852 Cl > > ' > > ' N2 eg: 'Mg Et ' 1equiv. 1equiv. ' ' Et 50%
More informationOrganocopper Reagents
rganocopper eagents General Information!!! why organocopper reagents? - Efficient method of C-C bond formation - Cu less electropositive than Li or Mg, so -Cu bond less polarized - consequences: 1. how
More informationO OH N. Me OMe N NH HO H Debenzoyltashironin NMe 2. Phalarine. Anne-Marie Dechert
Recent ighlights ht from the Danishefsky Laboratory 11-0-Debenzoyltashironin 2 Phalarine Anne-Marie Dechert ovember 7, 2007 11-0-Debenzoyltashironin Background and Structural Features Isolated from the
More informationOrganic Tutorials 3 rd Year Michaelmas Transition Metals in Organic Synthesis: (General paper level) ! 1! Reading
rganic Tutorials 3 rd Year Michaelmas 2010 Transition Metals in rganic Synthesis: (General paper level) Reading 1. Lecture Course, and suggested references from this. 2. Clayden, Greaves, Warren and Wothers.
More informationProblem session (3) Daiki Kuwana. Please fill in the blank and explain reaction mechanisms and stereoselectivities.
Problem session (3) Daiki Kuwana Please fill in the blank and explain reaction mechanisms and stereoselectivities. 1. 1-1 1. (Ac) 2 (10 mol%), DPEphos (20 mol%) Et 3, toluene, 90 C 2. s 4 (14 mol%), M;
More informationSuggested solutions for Chapter 32
s for Chapter 32 32 PBLEM 1 Explain how the stereo- and regio- chemistry of these reactions are controlled. Why is the epoxidation only moderately diastereoselective, and why does the amine attack where
More informationHighlights in the Progress of Biomimetic Strategies for the Construction of Complex Natural Products. Chris Galliford 26 th August 2003
ighlights in the Progress of Biomimetic Strategies for the Construction of Complex Natural Products Chris Galliford 26 th August 2003 The Biomimetic Approach Inspiration for biomimetic synthesis of a target
More informationLiterature Talk, Birte Schröder, , AK Gaich Group Seminar
2002 Literature Talk, Birte Schröder, 08.06.2016, AK Gaich Group Seminar 1 Detailed Syntheses Key steps (+) Austamide (-) Morphine (+)-brasilenyne ypnophilin - 3 S Cacospongionolide B VM55599 (+) Aspidospermidine
More informationCHEMISTRY MIDTERM # 2 November 02, The total number of points in this midterm is 100. The total exam time is 120 min (2 h). Good luck!
CEMISTRY 314-01 MIDTERM # 2 November 02, 2009 Name... The total number of points in this midterm is 100. The total exam time is 120 min (2 h). Good luck! 1. (8 pts) Mark as true (T) or false (F) the following
More informationSilenes in organic synthesis: a concise synthesis of (±)-epi-picropodophyllin
lenes in organic synthesis: a concise synthesis of (±)-epi-picropodophyllin obert D. C. Pullin, Jonathan D. Sellars, and Patrick G. Steel* rg. Biomol. Chem., 2007, 5, 3201-3206 H H C Adam Hoye Current
More informationChem 14D Spring 2010 Garg Midterm 1 Review / Practice Problems
Some Topics to Study (very broad): Chem 14D Spring 2010 Garg Midterm 1 Review / Practice Problems Reactivity stuff Classify atoms as electrophilic or nucleophilic Definitions of nucleophiles/electrophiles
More information11-Step Enantioselective Synthesis of ( )-Lomaiviticin Aglycon
11-Step Enantioselective Synthesis of ( )-Lomaiviticin Aglycon Seth B. erzon, Liang Lu, Christina M. Woo, and Shivajirao L. Gholap J. Am. Chem. Soc. ASAP DI 10.1021/ja200034b Melissa Sprachman Current
More informationSupplementary Material for: Unexpected Decarbonylation during an Acid- Mediated Cyclization to Access the Carbocyclic Core of Zoanthenol.
Tetrahedron Letters 1 Pergamon TETRAHEDRN LETTERS Supplementary Material for: Unexpected Decarbonylation during an Acid- Mediated Cyclization to Access the Carbocyclic Core of Zoanthenol. Jennifer L. Stockdill,
More informationSynthesis of Atisine-type Alkaloids
Literature Report III Synthesis of Atisine-type Alkaloids Reporter : Yang Zhao Checker : Zhou-ao Zhu Date : 2018-7-16 Ma, D. et al. Angew. Chem. Int. Ed. 2018, 57, 6676 Baran, P. S. et al. J. Am. Chem.
More informationCladiellin, Briarellin, Asbestinin & Sarcodictyin Diterpenes
Cladiellin, Briarellin, Asbestinin & Sarcodictyin Diterpenes I. Introduction Cembranes are a large class of macrocyclic diterpenes (C 20) isolated from a diverse group of organisms (both plants and animals)
More informationTotal Synthesis of ( )-Himandrine
Total Synthesis of ( )-imandrine M. Movassaghi,* M. Tjandra and J. Qi J. Am. hem. Soc. 2009, 131, 9648-9650 Bz Adam T. oye urrent Literature ctober 3, 2009 Adam oye @ Wipf Group Page 1 of 22 10/3/2009
More informationSynthesis of the Stenine Ring System from Pyrrole
Current Literature Presentation gor psenica 06/18/2011 Synthesis of the Stenine Ring System from Pyrrole Bates, R. W.; Sridhar, S. J. rg. Chem., 2011, 76, 5026 5035 gor psenica @ Wipf Group Page 1 of 16
More informationShort Lit
Short Lit. - 7-12-2010 Jonathan A. Brekan a Department of Chemistry, orthwestern University, 2145 Sheridan Road, 60208, Evanston, Illinois, United States of America Citronellal Monoterpenoid distillate
More informationProblem Session(5) Please provide each reaction mechanisms and explain the stereoselectivities.
Problem ession(5) Please provide each reaction mechanisms and explain the stereoselectivities. 2017.10.28. iroaki Matoba Boc 1.BF 3 Et 2,C 2 Cl 2,-78 C; allyltm,-78to-20 C 2.MsCl,Et 3,C 2 Cl 2,0 Ctort
More informationElectrophilic Carbenes
Electrophilic Carbenes The reaction of so-called stabilized diazo compounds with late transition metals produces a metal carbene intermediate that is electrophilic. The most common catalysts are Cu(I)
More informationFinal Exam /415 ( CHEM 6352 Fall %) Name
Final Exam /415 ( CEM 6352 Fall 2011 %) Name Dec. 15 th, 2011 8:00-12:00 You may NT use any references or aids to complete the following with the exception of a chemical model set and the scrap paper that
More informationReduction. Boron based reagents. NaBH 4 / NiCl 2. Uses: Zn(BH 4 ) 2. Preparation: Good for base sensitive groups Chelation control model.
Uses: Ar N 2 Ar N 2 Ar N Ar N 2 eduction Boron based reagents NaB 4 / NiCl 2 2 Ar C N Ar C N 2 Preparation: Zn(B 4 ) 2 ZnCl 2 (Ether) NaB 4 Zn(B 4 ) 2 Good for base sensitive groups Chelation control model
More informationCu- Catalyzed Synthesis of Diaryl Thioethers and S- Cycles by reaction of Aryl Iodides with Carbon Disul;ide in the Presence of DBU.
Cu- Catalyzed ynthesis of Diaryl Thioethers and - Cycles by reaction of Aryl odides with Carbon Disul;ide in the Presence of DBU. Peng Zhao, Hang Yin, Hongxin, Gao, Chanjuan Xi.; J. rg. Chem. ArCcle AAP
More informationVI. Metal alkyls from oxidative addition / insertion
V. Metal alkyls from oxidative addition / insertion A. Carbonylation - C insertion very facile, metal acyls easily cleaved, all substrates which undergo oxidative addition can in principle be carbonylated.
More informationShort Access to (+)-Lupinine and (+)-Epiquinamide via Double Hydroformylation
Short Access to (+)-Lupinine and (+)-Epiquinamide via Double Hydroformylation Kai Gao Checker: Changbin Yu Mann, A.* et al rg. Lett. 2009, ASAP Strategy for the formation of quinolizidine alkaloids R H
More informationTotal Synthesis of the Chartellines
Total Synthesis of the Chartellines X Y chartelline A, X = Y = chartelline B, X =, Y = chartelline C, X = Y = Mariam Shamszad ovember 1, 2006 Background Chartellines A, B, and C were isolated in the 1980s
More informationCHEMISTRY 332 FINAL EXAM. December 14, I. (18 points) II. (48 points) III. (50 points) IV. (40 points) V. (26 points) VI.
Seat No. Name (please print and circle your last name) CEMISTRY 332 FINAL EXAM December 14, 2005 I. (18 points) II. (48 points) III. (50 points) IV. (40 points) V. (26 points) VI. (18 points) TTAL (200
More information