Synthesis and Diels Alder Reactivity of Substituted [4]Dendralenes. Table of Contents

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1 Supporting Information for: Synthesis and Diels Alder Reactivity of Substituted [4]Dendralenes Mehmet F. Saglam, Ali R. Alborzi, Alan D. Payne, Anthony C. Willis,, Michael N. Paddon- Row and Michael S. Sherburn*, Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia. School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia. * michael.sherburn@anu.edu.au Table of Contents Page 1. Experimental Section... S2 1.1 General Methods... S2 1.2 Diels Alder Reaction Between [4]Dendralene (1) and N-Methylmaleimide (NMM) in Various Solvents... S4 1.3 Competitive NMR Experiment for the Diels Alder Reaction Between a 2:1 mixture of Isoprene (67) and 2,3-Dimethyl-1,3-butadiene (68) and N-Methylmaleimide (NMM)... S5 2. Crystallography Section... S7 2.1 Crystallographic Data for 33, 36, 40, 41, 45, 47, 50, 54, 55, 58, 59, and S7 2.2 Structure Determination... S9 2.3 Anisotropic Displacement Ellipsoid Plots for 33, 36, 40, 41, 45, 47, 50, 54, 55, 58, 59, and S H and 13 C NMR Spectra... S23 4. Stereochemical Assignments for 13, 14, 23, 24, 32, 37, 46, and S85 5. References... S98 Author to whom correspondence should be addressed regarding crystal structures. (willis@rsc.anu.edu.au). S1

2 1. Experimental Section 1.1 General Methods Reactions were performed under a positive pressure of dry nitrogen in oven or flame dried glassware, unless otherwise specified. Anhydrous THF was dried over sodium wire and distilled from sodium benzophenone ketyl. Other anhydrous solvents were dried using a solvent purification system outlined in the procedure by Grubbs et al. 1 Commercially available chemicals were used as purchased or purified by standard procedures. 2 Grignard reagents were titrated against salicylaldehyde phenylhydrazone according to the procedure of Love and Jones. 3 Microwave reactions were performed using a CEM Discovery instrument. Chromatography Analytical thin-layer chromatography (TLC) was performed with silica gel plates, precoated with silica gel 60 F 254 (0.2 mm) on aluminium sheets and visualized using UV fluorescence (λ max = 254 nm) and flash column chromatography employed using mesh silica gel. Analytical high performance liquid chromatography (HPLC) was performed using on a 5µm, mm, C18 column or a 5µm, mm, C18 column. NMR Spectroscopy 1 H and 13 C NMR spectra were recorded at 298 K using either 300, 400, or 800 MHz spectrometers. Residual chloroform (CHCl 3 in CDCl 3 ) ( = 7.26 ppm) was used for 1 H NMR spectra and the central line of the deuterochloroform (CDCl 3 ) triplet ( = 77.1 ppm) was used for 13 C NMR spectra as an internal reference. Assignment of proton and carbon signals were assisted by DEPT, COSY, HSQC or HMBC experiments where necessary. S2

3 Infrared Spectroscopy Infrared spectra were recorded on a FT-IR spectrometer as neat films on NaCl plates for oils or as KBr disks for solids. Mass Spectroscopy Low resolution mass spectra (LRMS) and high resolution mass spectra (HRMS) were recorded on a magnetic sector mass spectrometer using electron impact (EI + ) ionization mode at 70 ev. LRMS were reported with intensities quoted as percentages of the base peak. Melting Points Melting points were measured on a hot stage melting points apparatus and are uncorrected. S3

4 1.2 Diels Alder Reaction Between [4]Dendralene (1) and N-Methylmaleimide (NMM) in Various Solvents The solvent dependence of the Diels Alder reaction between parent [4]dendralene (1) and excess NMM (3 mol equiv) was examined. The product distribution obtained from reactions performed in THF, CH 2 Cl 2 and CDCl 3 were the same, demonstrating no significant solvent influence. Scheme S1: Diels Alder reaction between [4]dendralene (1) and excess NMM (3 mol equiv) in different solvents (THF, CH 2 Cl 2 and CDCl 3 ) at room temperature. Experimental procedure: A reaction vessel was charged with [4]dendralene (1) (15 mg, 0.14 mmol, 1.0 mol equiv), solvent (0.50 ml), and NMM (47 mg, 0.42 mmol, 3.0 mol equiv) and then capped. The reaction mixture was stirred for 21 hours at room temperature. The product composition was determined by analysis of the 1 H NMR spectra (800 MHz, at 25 C, in CDCl 3 ) (Table S1). In the case of the CDCl 3 reactions, direct analyses of the reaction mixtures by 1 H NMR spectroscopy was carried out. With runs in THF and CH 2 Cl 2, the solvent was removed under reduced pressure before CDCl 3 (0.5 ml) was added and the 1 H NMR spectrum was recorded. S4

5 Product Ratio (a) Solvent (b) CDCl 3 (c) CDCl CH 2 Cl THF Table S1: Diels Alder reaction between parent [4]dendralene (1) and excess (3 mol equiv) of NMM in different solvents at room temperature. (a) The crude product ratio was calculated based upon analysis of the crude 1 H NMR spectra (800 MHz, at 25 C, in CDCl 3 ), (b) Commercial CDCl 3 was used directly as received. (c) CDCl 3 was stored over K 2 CO 3 and 3Å molecular sieves before use. 1.3 Competition Experiment: Diels Alder Reaction Between a 2:1 (Isoprene (67) : 2,3-Dimethyl-1,3-butadiene (68)) Mixture and N-Methylmaleimide (NMM) The outcome of the reaction between the parent [4]dendralene (1) and excess NMM is shown in Scheme 2 of the main manuscript. Of the five products formed, four are the result of addition to the mono-substituted diene site and the remaining one product results from addition to the disubstituted diene site. The mono-substituted diene site of [4]dendralene (1) is preferred over the di-substituted diene site in a ratio of 78:22 (Scheme S2, top). To test if this outcome is simply the result of a preference for addition to a 2-substituted diene over a 2,3-disubstituted diene, a competition experiment was performed in which NMM was treated with a 2:1 mixture of isoprene (67) and 2,3-dimethyl-1,3-butadiene (68). This experiment gave a slight preference for S5

6 the more substituted diene (Scheme S2, bottom), demonstrating that [4]dendralene (1) does not behave as a simple mixtures of 1,3-butadienes. Scheme S2: A comparison of (top equation) the reactivity of [4]dendralene with NMM with (bottom equation) a 2:1 (isoprene (67) : 2,3-dimethyl-1,3-butadiene (68)) mixture with NMM. Experimental procedure: An NMR tube was charged with a 2:1 mixture of isoprene (67) (38 mg, 0.56 mmol, 7.3 mol equiv) and 2,3-dimethyl-1,3-butadiene (68) (23 mg, 0.28 mmol, 3.6 mol equiv), anisole (internal standard, 19 mg) and d 6 -benzene. To this was added a solution of N- methylmaleimide (8.6 mg, mmol, 1.0 mol equiv) in d 6 -benzene (0.30 ml). The resulting solution was allowed to stand for 16 hours at room temperature. The reaction progression was monitored by 1 H NMR spectroscopy and the reaction was deemed complete when NMM could no longer be observed. The ratio of the corresponding products 69 4 and 70 5 (44:56) was obtained from integration of the 1 H NMR spectrum of the reaction mixture. S6

7 2. Crystallography Section 2.1 Crystallographic Data for 33, 36, 40, 41, 45, 47, 50, 54, 55, 58, 59, and 60. Compound 33: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1, Z = 2, a = (4), b = (2), c = (3) Å, = (2) ; V = (6) Å 3, D x = g cm 3, 2067 unique data (2 max = 55 ), R = [for 1933 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 36: C 24 H 27 N 3 O 6, M = , T = 150 K, monoclinic, space group P2 1 /n, Z = 12, a = (2), b = (7), c = (7) Å, = (15) ; V = (3) Å 3, D x = g cm 3, unique data (2 max = 50 ), R = [for 6910 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 40: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1 /n, Z = 12, a = (4), b = (1), c = (4) Å, = (7) ; V = (13) Å 3, D x = g cm 3, 9266 unique data (2 max = 50 ), R = [for 5989 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 41: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1 /a, Z = 4, a = (2), b = (6), c = (3) Å, = (17) ; V = (8) Å 3, D x = g cm 3, 3999 unique data (2 max = 55 ), R = [for 2569 reflections with I > 2.0 (I)]; Rw = (all data), S = S7

8 Compound 45: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1, Z = 2, a = (4), b = (3), c = (5) Å, = (19) ; V = (6) Å 3, D x = g cm 3, 2208 unique data (2 max = 55 ), R = [for 2033 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 47: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1 /n, Z = 4, a = (4), b = (1), c = (11) Å, = (4) ; V = (19) Å 3, D x = g cm 3, 3970 unique data (2 max = 55 ), R = [for 2851 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 50: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1 /a, Z = 4, a = (1), b = (3), c = (3) Å, = (10) ; V = (5) Å 3, D x = g cm 3, 4873 unique data (2 max = 60 ), R = [for 3534 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 54: C 19 H 22 N 2 O 4, M = , T = 200 K, monoclinic, space group P2 1 /c, Z = 4, a = (2), b = (2), c = (6) Å, = (10) ; V = (7) Å 3, D x = g cm 3, 3752 unique data (2 max = 55 ), R = [for 2980 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 55: C 19 H 22 N 2 O 4 0.5(CH 2 Cl 2 ), M = , T = 200 K, monoclinic, space group P2 1 /a, Z = 4, a = (2), b = (4), c = (2) Å, = (9) ; V = (5) S8

9 Å 3, D x = g cm 3, 4392 unique data (2 max = 55 ), R = [for 2309 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 58: C 24 H 27 N 3 O 6 CH 2 Cl 2, M = , T = 200 K, monoclinic, space group P2 1 /a, Z = 8, a = (1), b = (2), c = (2) Å, = (6) ; V = (8) Å 3, D x = g cm 3, unique data (2 max = 55 ), R = [for 7015 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 59: C 24 H 27 N 3 O 6 H 2 O, M = , T = 200 K, orthorhombic, space group P , Z = 4, a = (3), b = (5), c = (11) Å; V = (15) Å 3, D x = g cm 3, 2345 unique data (2 max = 50 ), R = [for 1644 reflections with I > 2.0 (I)]; Rw = (all data), S = Compound 60: C 24 H 27 N 3 O 6 CHCl 3, M = , T = 200 K, monoclinic, space group Cc, Z = 4, a = (2), b = (2), c = (3) Å, = (11) ; V = (8) Å 3, D x = g cm 3, 5906 unique data (2 max = 55 ), R = [for 5203 reflections with I > 2.0 (I)]; Rw = (all data), S = Structure Determination Images were measured on a Nonius Kappa CCD diffractometer (MoK, graphite monochromator, = Å) and data extracted using the DENZO package. 6 Structure solution was by direct methods (SIR92). 7 The structures were refined using the CRYSTALS program package. 8 Atomic coordinates, bond lengths and angles, and displacement parameters S9

10 for compounds 33, 36, 40, 41, 45, 47, 50, 54, 55, 58, 59, and 60 have been deposited at the Cambridge Crystallographic Data Centre (CCDC nos , respectively). These data can be obtained free-of-charge via by ing or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: The CIFs are available as SI of this paper. The individual CIFs also contain details of refinement procedures used for that particular structure. S10

11 2.3 Anisotropic Displacement Ellipsoid Plots for 33, 36, 40, 41, 45, 47, 50, 54, 55, 58, 59, and 60. O17 C18 C1 N2 C3 O19 C15 C16 C4 C13 C5 C25 C24 C14 C6 C20 C12 C7 C11 O23 C10 N9 C8 O21 C22 Figure S1: Molecular structure of 33 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S11

12 C25 O24 C1 N2 C3 O26 C23 C4 C33 C21 C22 C5 C6 O32 C20 C15 C14 C13 C12 C7 C19 C16 O27 C11 N18 C31 C17 O30 N9 C8 C10 O29 C28 Figure S2: Molecular structure of 36 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S12

13 C18 N11 O24 O25 C12 C10 C9 C13 C8 C21 C14 C15 C16 C6 C5 C7 C19 C20 O22 C1 C4 C17 N2 C3 O23 Figure S3: Molecular structure of 40 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S13

14 C18 O24 O25 C12 N11 C9 C10 C13 C8 C15 C14 C6 C7 C21 C20 C19 C16 C5 O22 C1 C4 C17 N2 C3 O23 Figure S4: Molecular structure of 41 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S14

15 O22 C14 O25 N2 C1 C16 C15 C13 C12 C20 O23 C3 C4 C5 C7 C6 C8 C9 C10 N11 C21 C18 C17 O24 C19 Figure S5: Molecular structure of 45 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S15

16 C20 O23 C19 C18 C17 C16 O25 C15 N2 C3 C4 C5 C6 C10 C12 C11 C13 N14 C1 C21 O22 C7 O24 C9 C8 Figure S6: Molecular structure of 47 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S16

17 O12 O25 C24 C8 C9 C10 C1 C11 N13 C14 C23 N22 C7 C20 C6 C5 C4 C2 C3 C15 O16 O21 C18 C17 C19 Figure S7: Molecular structure of 50 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S17

18 C23 O25 C24 C8 C20 N22 O21 C9 C7 C6 O12 C11 C10 C1 C5 C4 C2 C3 N13 C14 C15 O16 C19 C17 C18 Figure S8: Molecular structure of 54 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S18

19 C23 N22 O25 C24 C20 C8 C7 C9 C10 C19 C6 C5 O12 C11 C1 C2 C3 C4 N13 C14 C15 O16 O21 C17 C18 Figure S9: Molecular structure of 55 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S19

20 O33 C9 C10 C32 N30 C28 O29 C11 C31 C12 C14 C13 C15 C1 O17 C16 C2 C19 N18 C20 O21 C8 C7 C4 C3 O27 C26 C6 N24 C5 C22 C25 O23 Figure S10: Molecular structure of 58 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S20

21 O17 O33 C31 C19 O21 C20 N18 C16 C1 C2 C15 C14 C13 C12 C32 C11 N30 C10 C9 C28 O29 C3 C4 C7 C8 C5 C6 O23 C22 C25 N24 C26 O27 Figure S11: Molecular structure of 59 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S21

22 O33 C19 N18 O21 C15 O17 C16 C14 C1 C20 C3 C2 C4 C13 C12 C11 C10 C9 C7 C32 C8 N30 C28 C31 O29 O23 C5 C22 N24 C25 C26 C6 O27 Figure S12: Molecular structure of 60 (CCDC ) with labeling of selected atoms. Anisotropic displacement ellipsoids show 30% probability levels. H atoms are drawn as circles with small radii. S22

23 3. 1 H and 13 C NMR Spectra S23

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85 4. Stereochemical Assignments for 13, 14, 23, 24, 32, 37, 46, and 51. The stereochemistry of 23 was secured through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S13. Figure S13: 1 H 1 H NOESY NMR (400 MHz, in CDCl 3 ) spectrum of 23. S85

86 The stereochemistry of 13 was secured through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S14. Figure S14: 1 H 1 H NOESY NMR (500 MHz, in CDCl 3 ) spectrum of 13. S86

87 The stereochemistries of 25 and 27 were assigned by comparison of 1 H NMR spectra with 23 and 13. Similarities between 1 H NMR spectra of 23, 25, 27, and 13 are highlighted in Figure S15. Figure S15: 1 H NMR spectra (300 MHz, in CDCl 3 ) of 23, 25, 27, and 13. S87

88 The stereochemistry of 24 was secured through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S16. Figure S16: 1 H 1 H NOESY NMR (400 MHz, in CDCl 3 ) spectrum of 24. S88

89 The stereochemistry of 14 was secured through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S17. Figure S17: 1 H 1 H NOESY NMR (500 MHz, in CDCl 3 ) spectrum of 14. S89

90 The stereochemistries of 26, and 28 were assigned by comparison of 1 H NMR spectra with 24 and 14. Similarities between 1 H NMR spectra of 24, 26, 28, and 14 are highlighted in Figure S18. Figure S18: 1 H NMR spectra (300 MHz, in CDCl 3 ) of 24, 26, 28, and 14. S90

91 The stereochemistry of 32 was assigned through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S19. Figure S19: 1 H 1 H NOESY NMR spectrum (800 MHz, in CDCl 3 ) of 32. S91

92 Similarities between 1 H NMR spectra of 50, 45, 40, 32, and 4 are highlighted in Figure S20. Single crystal X-ray analysis of 50 (Figure S7), 45 (Figure S5), 40 (Figure S3) and 4 9 secured the stereochemical assignments of compound 32. Figure S20: 1 H NMR spectra (300 MHz, in CDCl 3 ) of 50, 45, 40, 32 and parent [4]dendralene bis-adduct 4. 9 S92

93 The stereochemistry of 53 was assigned through 2D NMR experiments. The 1 H 1 H NOESY spectrum is shown in Figure S21. Figure S21: 1 H 1 H NOESY NMR spectrum (800 MHz, in CDCl 3 ) of 53. S93

94 The stereochemistry of minor bis-adduct 51 was also assigned by comparison of 1 H NMR spectra with minor bis-adduct 41. Similarities between 1 H NMR spectra of 51 and 41 are highlighted in Figure S22. Single crystal X-ray analysis of 41 (see Figure S4) secured the stereochemical assignments of compound 51. Figure S22: 1 H NMR spectra (300 MHz, in CDCl 3 ) of 51 and 41. S94

95 Similarities between 1 H NMR spectra of 47 and parent [6]dendralene terminal-terminal bis-adduct B1 10 are highlighted in Figure S23. Single crystal X-ray analysis of 47 (see Figure S6) and B1 10 secured the stereochemical assignments of these compounds. Figure S23: 1 H NMR spectra of 47 (300 MHz, in CDCl 3 ) and B1 10 (500 MHz, in CDCl 3 ). S95

96 Similarities between 1 H NMR spectra of 46 and parent [6]dendralene terminal-terminal bis-adduct B2 10 are highlighted in Figure S24. Tentative stereochemical assignment of compound 46 was made by 1 H NMR in analogy to similar compound B2. Figure S24: 1 H NMR spectra of 46 (300 MHz, in CDCl 3 ) and B2 10 (500 MHz, in CDCl 3 ). S96

97 The stereochemistry of tris-adduct 37 was assigned by comparison of 1 H NMR spectra with tris-adduct 9. Similarities between 1 H NMR spectra of 37 and 9 are highlighted in Figure S25. Single crystal X-ray analysis of 9 9 secured the stereochemical assignments of compound 37. Figure S25: 1 H NMR spectra (800 MHz, in CDCl 3 ) of 37 and parent [4]dendralene tris-adduct 9. 9 S97

98 5. References ( 1 ) Pangborn, A. B.; Giardello, M. A.; Grubbs, R. H.; Rosen, R. K.; Timmers, F. J. Organometallics 1996, 15, (2) Armarego, W. L. F.; Chai, C. L. L. in Purification of Laboratory Chemicals - 5 th Edn. (Butterworth Heinemann, Cornwall, 2003). (3) Love, B. E.; Jones, E. G. J. Org. Chem. 1999, 64, (4) Fringuelli, F.; Girotti, R.; Pizzo, F.; Vaccaro, L. Org. Lett. 2006, 8, (5) Hu, Z.; Lakshmikantham, M. V.; Cava, M. P. J. Org. Chem. 1992, 57, (6) DENZO SMN. Otwinowski, Z.; Minor, W. Processing of X-ray diffraction data collected in oscillation mode. In Methods in Enzymology, Volume 276: Macromolecular Crystallography, Part A; Carter Jr., C. W.; Sweet, R. M., Eds.; Academic Press: New York, 1997; pp (7) SIR92. Altomare, A.; Cascarano, G.; Giacovazzo, C.; Guagliardi, A.; Burla, M. C.; Polidori, G.; Camalli, M. J. Appl. Crystallogr. 1994, 27, 435. (8) Betteridge, P. W.; Carruthers, J. R.; Cooper, R. I.; Prout, K.; Watkin, D. J. J. Appl. Crystallogr. 2003, 36, (9) Payne, A. D.; Willis, A. C.; Sherburn, M. S. J. Am. Chem. Soc. 2005, 127, (10) Bojase, G. P. PhD Thesis, The Australian National University, S98