Synthesis and stereochemistry of Reissert compounds from benzothiazole
摘要:
Benzothiazole Reissert compounds 1-5 were synthesized, characterized and alkylated to produce 6-9. Conformational analysis of 2 by the use of high resolution (400 MHz) variable temperature NMR spectroscopy indicated that the Z to E amide conformer ratio is 79:21 (+/-3%) in CDCl3 at 213 K (-60-degrees-C) and 57:43 (+/-3%) in C6D5CD3 at 213 K. Aromatic solvent induced shifts were employed to determine the distribution of rotamers and indicated that the alkylated benzothiazole Reissert compound 8 existed in only the Z amide conformation. Hindered aryl-carbonyl rotation was also detected in the Reissert compounds.
Reissert compound formation with five-membered ring heterocycles using trimethylsilyl cyanide
作者:Barrie C. Uff、S. L. Anne、A. Chen、Yee-Ping Ho、Frank D. Popp、Joydeep Kant
DOI:10.1039/c39840001245
日期:——
benzothiazole with trimethylsilyl cyanide and an acid chloride in CH2Cl2 gives the N-acyl-2-cyano-2,3-dihydrobenzothiazole in good yield; benzoxazole similarly is converted into a five-membered ring Reissertcompound, providing the first examples in these series.
UFF, B. C.;CHEN, S. L. A. A.;HO, YEE-PING;POPP, F. D.;KANT, JOYDEEP, J. CHEM. SOC. CHEM. COMMUN., 1984, N 18, 1245-1246
作者:UFF, B. C.、CHEN, S. L. A. A.、HO, YEE-PING、POPP, F. D.、KANT, JOYDEEP
DOI:——
日期:——
Uff, Barrie C.; Ho, Yee-Ping; Brown, David S., Journal of Chemical Research, Miniprint, 1989, # 11, p. 2652 - 2681
作者:Uff, Barrie C.、Ho, Yee-Ping、Brown, David S.、Fisher, Ian、Popp, Frank D.、Kant, Joydeep
DOI:——
日期:——
Synthesis and stereochemistry of Reissert compounds from benzothiazole
作者:Ashish Pandya、Harry W. Gibson
DOI:10.1021/jo00062a032
日期:1993.5
Benzothiazole Reissert compounds 1-5 were synthesized, characterized and alkylated to produce 6-9. Conformational analysis of 2 by the use of high resolution (400 MHz) variable temperature NMR spectroscopy indicated that the Z to E amide conformer ratio is 79:21 (+/-3%) in CDCl3 at 213 K (-60-degrees-C) and 57:43 (+/-3%) in C6D5CD3 at 213 K. Aromatic solvent induced shifts were employed to determine the distribution of rotamers and indicated that the alkylated benzothiazole Reissert compound 8 existed in only the Z amide conformation. Hindered aryl-carbonyl rotation was also detected in the Reissert compounds.