Benzothiazole compounds XXVII. Alkylation and antifungal activity of some 2-R-3-(2-mercaptoethyl)benzothiazolines

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Benothiaole copounds XXVII. Alkylation and antifungal activity of soe 2-R-3-(2-ercaptoethyl)benothiaolines a S. MIKULÁŠEK, a V. SUTORIS, a A. PERJÉSSY, and b P.

1 Benothiaole copounds XXVII. Alkylation and antifungal activity of soe 2-R-3-(2-ercaptoethyl)benothiaolines a S. MIKULÁŠEK, a V. SUTORIS, a A. PERJÉSSY, and b P. FOLTÍNOVÁ a Departent of Organic Cheistry, Faculty of Natural Sciences, Koenský University, CS Bratislava b Institute of Molecular and Subcellular Biology, Koenský University, CS Bratislava Received 31 July 1985 The series of 2-R-3-(2-R'-thioethyl)benothiaolines and allyl esters of bis[2-(2-r-3-benothiaolinyl)ethylthio]acetic acid were synthesied by alkylation of 3-(2-ercaptoethyl)-2-benothiaolinone oxie, 3-(2-ercaptoethyl)-2-benothiaolinone seicarbaone, and 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone with corresponding reactive copounds. The structures of prepared copounds were confired by infrared spectra. The antibacterial activity of copounds is rather low, however the results of the antifungal tests showed ore favourable results. Посредством алкилирования 3-(2-меркаптоэтил)-2-бензотиазолиноноксима, 3-(2-меркаптоэтил)-2-бензотиазолинонсемикарбазона и 3-(2- -меркаптоэтил)-2-бензотиазолинонтиосемикарбазона соответствующими реагентами был синтезирован ряд 2^-3-(2^'-тиоэтил)бензотиазолинов и аллиловых эфиров бис[2-(2^-3-бензотиазолинил)этилтио]уксусной кислоты. Строение полученных соединений было подтверждено их ИК- -спектрами. Антибактериальная активность этих соединений довольно низка, однако тесты на противогрибковую активность имели более удовлетворительные результаты. The present paper represents the continuation of studies of syntheses on the basis of benothiaole. It is connected with our previous paper [1] in the sense that nucleophilic substitution reactions on 2,3-dihydrothiaolo[2,3-fe]benothiaoliu chloride [2 4] were used to prepare the starting copounds, i.e. 3-(2-ercaptoethyl)-2-benothiaolinone oxie, 3-(2-ercaptoethyl)-2-benothiaolinone seicarbaone, and 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone. The positive charge on the nitrogen ato of benothiaoliu salt causes the increase of polarity of the C=N bond, which creates favourable conditions for nucleophilic substitution reactions. The above-entioned reactivity of benothiaoliu salts was already discussed [5 8]. Considering the preceding results [9 12] the ai of this work was the alkylation of soe benothiaolinone derivatives substituted in positions 2 and 3. Ethylene Che. Papers 40(6) (1986) 779

2 S. MIKULÁŠEK, V. SUTORIS, A. PERJÉSSY, P. FOLTÍNOVÁ chlorohydrin, esters of chloroforic, chloroacetic, and dichloroacetic acid, chloroacetic acid, acetyl chloride, phenylacetyl chloride, benoyl chloride, ethanesulfonyl chloride, and benenesulfonyl chloride were used as alkylation agents. The copounds synthesied were tested for antibacterial and antifungal activity. The starting copound was prepared by chlorination of 2-(2-hydroxyethylthio)benothiaole with thionyl chloride and consequent cycliation of the originated 2-(2-chloroethylthio)benothiaole. Besides of tetrahydrofuran, anhydrous benene was used as a solvent, too. As nucleophilic agents in the reaction with starting copounds hydroxylaine, seicarbaide, and thioseicarbaide were eployed in the for of chlorides. Using the above-described reactions interediates were prepared, in which the acidity of the hydrogen atos of SH, OH, and NH 2 groups in appertaining substituents in positions 2 and 3 on the thiaole ring was utilied. Monosubstituted and disubstituted derivatives or bisderivatives were obtained by alteration of the reaction conditions and the ratio of the quantities of copounds taking place in the reaction. The data of eleental analysis and physical constants of the synthesied copounds are given in Tables 1 and 2. The ost reactive appeared the SH group, on which the substitution reaction passed through in each case. The corresponding disubstituted derivatives of benothiaolinone were obtained in ost cases refluxing the reaction ixture during 2 h. If the reaction ixture was not cooled sufficiently (in the case of exotheric reaction) bisderivatives were fored siultaneously. Siilar ixture of products was isolated in the case of copound V. Using colun chroatography on silica gel (a ixture of ethanol and benene (volue ratio =1:8) being the eluent) disubstituted derivative XII was isolated fro both the first and second fractions, while the third fraction contained onosubstituted derivative V. The wavenubers of characteristic vibrations of the synthesied benothiaolinones are given in Table 3. In copounds II IV and VII the oxie group exhibits a characteristic band of the О H stretching vibration in the region v = c -1. The presence of the ester group in substituents R 1 can be confired by two intensive absorption bands in the region (v= c" 1 and c" 1 belonging to v(c=0) and v(c O) vibrations, respectively. The wavenubers of the v(c=0) bands change in harony with the effect of substituents bonded on the C=0 group. In the spectra of copounds XII and XIII the absorption in the region of О H stretching vibrations is absent and the two absorption bands in the region of v(c=0) at higher and lower values of v can be assigned to О CO О and 780 Che. Papers 40(6) (1986)

3 9 i Copound Table I 2-R-3-(2-R4hioethyl)benothiaolines so» ^CHJCHJS R 1 Forula M н»,(са1с.)/% *í(found)/% H N ci Yield/% M.p./ C Mixture of solvents (volue ratio) s r n o 2 3 G Ö / II III IV V vr V7/ WJ/ IX NOT CH2CH2OH C H 14 ON2S CH 2 COOC 2 H 5 C 13 H 16 03N2S CH 2 COOCH 2 CH 2 a C 13 H 15 03N2S 2 a CH 2 COOC 3 H 7 C 14 H 18 03N 2 S COOC2H5 C 12 H 14 03N2S COOCH(CH 3 ) 2 C I3 H I6 03N 2 S СН 2 СООСН(СНз) 2 C 14 H 18 03N 2 S CH2COOH CnH 12 03N 2 S SO2CH3 C 10 H 12 03N 2 S Acetone-ethanol (2:1) DMSO e ethanol (5:1) Acetone 00 d) DMSO diethyl sulfoxide.

4 Table 1 (Continued) Copound R R 1 Forula M r C H [caic.)/% found)/% N s a Yield/% M.p.Aľ Mixture of solvents (volue ratio) X XI хп xin XIV XV XVI XVII XVIII NOCOCH3 NOCOOC2H5 NOCOOCH(CH 3 ) 2 NOCOOCH 2 C^CH NOCOQH5 NOCOCH 2 C ft H 5 NOS0 2 C 6 H 5 NNHCONH 2 сосн 5 COCH3 COOC 2 H 5 COOCH(CH 3 ) 2 COOCH 2 C=CH COQH 5 COCH2QH5 S0 2 QH 5 COOC 2 H 5 С.бНмЗД^Ь C 13 H N 2 S 2 C 15 H I8 0 5 N 2 S2 C^H^N^ C 17 H N 2 S2 C 2 3H N 2 S2 C25H22O3N2S2 C 21 H N 2 S 4 С.зН.бОз^ Benene cyclohexane (5:1) Benene cyclohexane (5:1) Benene cyclohexane (5:1) Benene cyclohexane (5:1) < 1 2 > r* 3 0

5 BENZOTHIAZOLE COMPOUNDS. XXVII i _ >.2 P S В do с * i I. ё, ё, a -ü )ne ethanol >ne ethanol )ne ethanol >ne ethanol i-h Cd,-н Cd *-н CO i-h г- г-н Cd 2 ON «О С» О»О OO T+ P '1 ^,_ч ^ "^ "3" I I I I 1 o w ^ c o c o v o f - o r - c o ^ o o o v o о о о ч о о ^ о о и ч о с о с ч с о ' О ' ^ и ч т г T o o o o t N O ^ O N v n t N t N ^ H r - j O N O N C N o r - r - t N O N o q ^ o o q r - ; 5 OO ON CM ON С» Г-; in ГП Ti" Tí" TÍ ^ TÍ- CO ся Z q и Z q u Z d ' o: u Z q q q ú o o u «g o i C7ie. Papers 40 (6) (1986) 783

6 TaWe 2 Allyl ester of bis[2-(2-r-3-benothiaolinyi)ethylthio]acetic acid coi,>- V A OT> l Ĺ /CHCOOCH 9 CH=CH 9 g Copound Forula M v^(caic.)/% w,(found)/% H N Yield/% M.p./ C Mixture of solvents (volue ratio) о 5Ö XXVI C 23 H N 4 S4 XXVII NHNCSNH 2 C 25 H N 8 S Acetone water (3:1) Acetone water (3:1) о <

7 D i о "8 a Tabie 3 X Copound Wavenubers of the characteristic vibrations of 2-R-3-(2-R! -thioethyl)benothiaolines v/c v(c=0) v(c=n) v(bt-ring) Other vibrations n o O G II IV vn IX XII 1690 s 1705 s 1686 s 1676 s 1760 vs, 1680 s 1615 vs 1598 s 1613 vs 1608 vs 1650 w - e vs 1565 s v(oh) 3390 vs, v(oh) 3370 s, 'v(oh) 3382 vs, v(oh) 3363 s, v(oh) 3410 s, v(c O) 1163vs, v(c O) v(c O) v(c O) v(c O) 1285 vs 1277 vs 1283 vs 1285 vs v M (S0 2 ) 1325 vs, v.(s0 2 ) 1165 vs 1218 vs Х1П 1765 s, 1685 s 1650 sh 1575 s v(c O) 1164vs, 1222 vs XV XVII xv XIX XX xx XXIV XXV 1723 s, 1687 s, 1698 sh, 1710, 1715, 1700 sh, 1710 sh 1646 vs 1655 vs 1685 s 1685 s 1685 s w a s 1601s 1608 s 1553 vs 1650 vs 1565 vs b 1550 vs b 1525 vs c 1648 vs b 1670 vs b 1670 vs b v(c-0) v M (S0 2 ) v(nh 2 ) v(nh 2 ) v(oh) v(nh) v(nh) v(nh) 1250 vs 1350 vs, 3400 s, 3420 s, 3380, v.(s0 2 ) v(nh) v(nh) v(nh) s 3140 s 3200 ВТ benothiaole, vs very strong, s strong, ediu, w weak. a) Overlapped with the v(c=0) band; b) overlapped with Ô(NH) and Ô(NH 2 ) bands; c) overlapped with Ô(NH) and ô(oh) bands.

8 S. MIKULÁŠEK, V. SUTORIS, A. PERJÉSSY, P. FOLTÍNOVÁ ТаЬ/е 4 Biological activity of 2-R-3-(R'-thioethyl)benothiaolines and allyl esters of bis[2-(2-r-3-benothiaolinyl)ethylthio]acetic acids Copound Fungicidal g/(\ig c _3 )/fungistatical p/(ug c" 1 ) Microsporu gypse u Trichophyton rubru I IV VI VIII IX X XI XII XIII XIV XV XVI XVII XVIII XIX XXI XXII XXIII XXIV XXV XXVI KXVII 400/>200 >4()0/400 >40()/ / / />l()0 400/ /> />30 200/>50 400/> /> />100 S CO О groups, respectively. It follows fro the above data that the structures of copounds XII and XIII correspond to disubstituted derivatives. Siilarly, copound XV exhibits a structure of disubstituted derivative, which follows fro a doubled band of v(c=0), whereby the axiu at higher wavenubers corresponds to the О CO group and the shoulder at lower wavenubers can be assigned to the S CO grouping. The spectra of copounds XVIII and XIX can be described in analogous way. The wavenubers of v(c=0) in the NH CO NH 2 group are observed at lower values than those in the CO О group. The structure of the above-discussed copounds can be proved also in the region v = c -1 by the absorption bands corresponding to stretching vibrations of NH and NH 2 groups, respectively. In the case of copounds XXIII XXV the occurrence of a doublet in the 786 Che. Papers 40{b) (1986)

9 BENZOTHIAZOLE COMPOUNDS. XXVII wavenuber region of the v(c=0) vibrations and the absence of absorption in the range of NH 2 stretching vibrations deonstrates again the structure of disubstituted derivatives. The structure of copounds IX and XVII can be confired by two strong absorption bands in the region v = c" 1 and c" 1 belonging to v as (S0 2 ) and v s (S0 2 ) vibrations, respectively. In the case of copound XX because of the presence of NH 2 and OH groups it is rather coplicated to interpret the spectra in the region v = c" 1. It can be supposed, however, that the band at higher wavenubers corresponds to the stretching vibration of OH group, while that at the lower values can be assigned to the stretching vibration of the NH 2 group. The presence of the C=N group in all copounds investigated can be proved by the absorption bands of v(c=n) at v«1600 c" 1. The antibacterial tests (carried out by both the plate-diffusion and dilution ethods [13]) showed rather a slight activity of the copounds prepared. On the other hand, ost of the copounds investigated possess a satisfactory antifungal activity when tested against Microsporu gypseu and Trichophyton rubru using a dilution ethod (Table 4). Experiental Infrared spectra were easured on a 75 IR Specord (Zeiss, Jena) spectrophotoeter in the region v = c" 1 in paraffin oil suspensions using cells of 0.02 thickness. The wavenuber scale of the instruent was calibrated according to standard spectra of polystyrene. The wavenuber values were deterined with the accuracy of ±2 c -1. 2,3-Dihydrothiaolo[2,3-b]benothiaoliu chloride, 3-(2-ercaptoethyl)-2-benothiaolinone oxie, 3-(2-ercaptoethyl)-2-benothiaolinone seicarbaone, and 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone were prepared according to the ethod described in [1]. 3-[2-(Ethoxycarbonylethylthio)ethyl]-2-benothiaoIinone oxie (II) 3-(2-Mercaptoethyl)-2-benothiaolinone oxie (22.6 g; 0.10 ol) was dissolved in anhydrous acetone (150 c 3 ) under heating and triethylaine (13.0 g; 0.12 ol) was added. Afterwards ethyl ester of onochloroacetic acid (12.2 g; 0.10 ol) was added dropwise under siultaneous stirring. Then the reaction ixture was refluxed for 1 h on a water bath, allowed to stand for 24 h at the roo teperature and poured on crushed ice. The crude product was purified with activated carbon and recrystalliation. 3-[2-(2-Hydroxyethylthio)ethyl]-2-benothiaolinone oxie (J), 3-[2-(2-chloroethyloxycarbonylethylthio)ethyl]-2-benothiaolinone oxie (HI), 3-[2-(propyloxycarbonylethylthio)ethyl]-2-benothiaolinone oxie (IV), 3-[2-(isopropyloxycarbonylethylthio)ethyl]-2-benothiaolinone oxie (VII), and 3-[2-(carboxyethylthio)ethyl]-2-benothiaolinone oxie (VIII) were prepared in the sae way. Che. Papers 40(6) (1986) 787

S. MIKULÁŠEK, V. SUTORIS, A. PERJÉSSY, P. FOLTÍNOVÁ 3-[2-(MethylsulfonyIthio)ethyl]-2-benothiaolinone oxie (IX) 3-(2-Mercaptoethyl)-2-benothiaolinone oxie (11.3 g; 0.

10 S. MIKULÁŠEK, V. SUTORIS, A. PERJÉSSY, P. FOLTÍNOVÁ 3-[2-(MethylsulfonyIthio)ethyl]-2-benothiaolinone oxie (IX) 3-(2-Mercaptoethyl)-2-benothiaolinone oxie (11.3 g; 0.05 ol) was dissolved in anhydrous acetone (150 c 3 ) at the roo teperature and triethylaine (8.0 g; 0.07 ol) was added. Then a solution of ethanesulfonyl chloride (5.7 g; 0.05 ol) in anhydrous acetone (3 c 3 ) was added dropwise under stirring. The course of the reaction is exotheric and therefore it is necessary to cool the reaction ixture with glacial water. A precipitate of triethylaoniu chloride was fored as a secondary product during the addition of the second reaction coponent. The reaction ixture was allowed to stand for 1 h and poured on crushed ice. The crude product was isolated, purified with activated carbon and recrystallied. 3-[2-(Ethoxycarbonylthio)ethyl]-2-benothiaolinone oxie (V), 3-[2-(isopropyloxycarbonylthio)ethyl]-2-benothiaolinone oxie (VI), and 3-[2-(benoylthio)ethyl]-2-benothiaolinone oxie (X) were synthesied in the siilar way. 2-Acetyloxyiino-3-[2-(acetylthio)ethyl]benothiaoline (XI) 3-(2-Mercaptoethyl)-2-benothiaolinone oxie (11.3g; 0.05 ol) was dissolved in anhydrous acetone (100 c 1 ) under heating. The excess of triethylaine (20.0 g; 0.19 ol) and afterwards a solution of the double quantity excess of acetyl chloride (10.0 g; 0.12 ol) in anhydrous acetone (10 c 3 ) was added dropwise to the reaction ixture at the teperature C under siultaneous stirring. Then the reaction ixture was refluxed for 2 h on a water bath, allowed to stand for 24 h and poured on crushed ice. The isolated crude product was purified using activated carbon and crystalliation. The sae procedure was used to prepare 2-ethoxycarbonyloxyiino-3-[2-(ethoxycarbonylthio)ethyl]benothiaoline (XII), 2-isopropyloxycarbonyloxyiino-3-[2-(isopropyloxycarbonylthio)ethyl]benothiaoline (XIII), 2-propargyloxycarbonyloxyiino-3-[2- -(propargyloxycarbonylthio)ethyl]benothiaoline (XIV), 2-benoyloxyiino-3-[2-(benoylthio)ethyl]benothiaoline (XV), 2-benylcarbonyloxyiino-3-[2-(benylcarbonylthio)ethyl]benothiaoline (XV/), and 2-phenylsulfonyloxyiino-3-[2-(phenylsulfonylthio)ethyl]benothiaoline (XVII). 2-Seicarbaono-3-[2-(ethoxycarbonylthio)ethyl]benothiaoline (XVIII) 3-(2-Mercaptoethyl)-2-benothiaolinone seicarbaone (13.4 g; 0.05 ol) was dissolved in inial quantity of diethyl sulfoxide at the roo teperature, then anhydrous acetone (80 c 3 ) and a slight excess of triethylaine (7.0 g; 0.07 ol) was added. Afterwards ethyl ester of chloroforic acid (5.4 g; 0.05 ol) in anhydrous acetone (3 c 3 ) was added dropwise under stirring. A precipitate of triethylaoniu chloride originated gradually. The reaction ixture was allowed to stand for 2 h and poured on crushed ice. The isolated crude product was purified with activated carbon and recrystalliation. 788 Che. Papers 40(6) (1986)

11 BENZOTHIAZOLE COMPOUNDS. XXVII 2-Seicarbaono-3-[2-(ethoxycarbonylethy1thio)ethyl]benothiaoline (XIX) The conditions of the synthesis were the sae as in the case of copound XVIII, with differences that ethyl ester of chloroacetic acid (6.1 g; 0.05 ol) was used as the reaction coponent and the reaction ixture was refluxed for 1 h. 2-Thioseicarbaono-3-[2-(2-hydroxyethylthio)ethyl]benothiaoline (XX) The preparation was analogous to that of copound XVIIL with differences that 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol) and ethylene chlorohydrin (4.0 g; 0.05 ol) were used as the reaction coponents. The reaction ixture was refluxed for 1 h on a water bath. 2-Thioseicarbaono-3-[2-(2-chloroethoxycarbonylethylthio)- ethyljbenothiaoline (XXI) The synthesis was siilar to that of copound XVIII, however 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (7.8 g; 0.05 ol) and chloroethyl ester of chloroacetic acid were used as the reaction coponents. The reaction ixture was heated to C for 2 h on a water bath. 2-Ethoxycarbonylthioseicarbaono-3-[2-(ethoxycarbonylthio)- ethyljbenothiaoline (XXII) The procedure of the synthesis was analogous as in the case of copound XVIII, with differences that 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol), triethylaine (14.0 g; 0.13 ol), and ethyl ester of chloroforic acid (10.8 g; 0.10 ol) in a double quantity were used as reaction coponents. 2-Ethoxycarbonylethylthioseicarbaono-3-[2-(ethoxycarbonylethylthio)ethyl]benothiaoiine (XXIII) The synthesis was the sae as in the case of copound XVIII with differences that 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol) and a double quantity of triethylaine (14.0 g; 0.13 ol) and ethyl ester of chloroacetic acid (12.2 g; 0.10 ol) were used in the reaction. The reaction ixture was heated for 1 h on a water bath under reflux. 2-Propyloxycarbonylethylthioseicarbaono-3-[2-(propyloxycarbonylethylthio)ethyl]benothiaoline(XXIV) The copound was prepared in the sae way as the copound XVIII, with a difference that 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol) and Che. Papers 40 (6) (1986) 789

12 S. MIKULÁŠEK, V. SUTORIS, A. PERJÉSSY, P. FOLTÍNOVÁ a double quantity of triethylaine (14.0 g; 0.13 ol) and propyl ester of chloroacetic acid (13.6 g; 0.10 ol) were used. The reaction ixture was heated for 1 h on a water bath under reflux. 2-Isopropyloxycarbonylethylthioseicarbaono-3-[2-(isopropyloxycarbonylethylthio)ethyl]benothiaoline (XXV) The procedure was the sae as in the case of copound XVIII, but 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol) and a double quantity of triethylaine (14.0 g; 0.13 ol) and isopropyl ester of chloroacetic acid (13.6 g; 0.10 ol) were used as the reactive coponents. The reaction ixture was heated for 1 h to C on a water bath. AUyl ester of bis[2-(2-thioseicarbaono-3-benothiaolinyl)- ethylthio]acetic acid (XXVII) The preparation was the sae as in the case of copound XVIII, but 3-(2-ercaptoethyl)-2-benothiaolinone thioseicarbaone (14.2 g; 0.05 ol), allyl ester of dichloroacetic acid (8.4 g; 0.05 ol), and a double quantity of triethylaine (14.0 g; 0.13 ol) were used. The reaction ixture was allowed to stand for 1 h. The copound XXVI was synthesied analogously, however 3-(2-ercaptoethyl)-2- -benothiaolinone oxie (11.3 g; 0.05 ol) was used. References 1. Sutoris, V., Malovíková, A., Jakubcová, J., Foltínová, P., and Blóckinger, G., Che. Zvesti 33, 558 (1979). 2. Kunetsova, E. A., Zhuravlev, S. V., and Stepanova, T. N., Zh. Org. Khi. 1965, Sonar, P., Denny, G. H., and Babson, R. D., J. Heterocyci Che. 6, 163 (1969). 4. Stanovnik, B. and Tišler, M., Angew. Che. 78, 645 (1966). 5. Sexton, W., J. Che. Soc. 1939, Huhnig, S., Justus Liebigs Ann. Che. 708, 198 (1967). 7. Quast, A. and Sitt, E., Che. Ber. 101, 4012 (1968). 8. Sohár, P., Denny, G. H., and Babson, R. D., J. Heterocyci Che. 7, 1369 (1970). 9. Sutoris, V., Foltínová, P., and Blóckinger, G., Che. Zvesti 27, 698 (1973). 10. Sutoris, V., Blóckinger, G., Foltínová, P., and Perjéssy, A., Che. Zvesti 27, 703 (1973). 11. Sutoris, V., Orosová, Ľ., and Foltínová, P., Che. Zvesti 30, 179 (1976). 12. Mikulášek, S., Odlerová, Ž., Sutoris, V., Perjéssy, A., and Solčániová, E., Che. Zvesti 32, 691 (1978). 13. Foltínová, P., Sutoris, V., Sodoová, J., and Halgaš, J., Biológia (Bratislava) 38, 671 (1983). Translated by A. Perjéssy 790 Che. Pap 40(b) (1986)

Benzothiazole compounds XXVIII. Synthesis of 2-styrylbenzothiazolium salts substituted at position 3 and their biological activity

Benzothiazole compounds XXVIII. Synthesis of 2-styrylbenzothiazolium salts substituted at position 3 and their biological activity Benzothiazole copounds XXVIII. ynthesis of 2-styrylbenzothiazoliu salts substituted at position 3 and their biological activity a P. CHABREČEK, a V. UTORI, b P. FOLTÍNOVÁ, C V. EKERKA, and d A. GÁPLOVKÝ