A Simple and Efficient Method for Synthesis of Benzothiazepine Derivatives
摘要:
A series of 1,5-benzothiazepines were synthesized using disulfides and alpha,beta-unsaturated carbonyl or nitrite compounds as reaction substrates. After reductive cleavage of the S-S bond of disulfides, the resulting thiols were reacted with alpha,beta-unsaturated carbonyl or nitrite compounds to generated seven-membered heterocyclic compounds. In the presence of ammonium thioglycolate, the Michael reaction occurred between disulfides (1) and 4-methyl-3-penten-2-one to give 2,2,4-trymethyl-3H-1,5-benzothiazepine derivatives in good yields. When ethyl acrylate or acrylonitrile was used as the Michael acceptor, 90-99% of (2-amino-phenylsulfanyl)propionitriles (3) and/or 92-99% of (2-amino-phenylsulfanyl)propionic acid ethyl esters (4) were produced. Subsequently, the 1,5-benzothiazepine compounds 5 and 6 were obtained due to the cyclization reaction.
Catalysis by an ionic liquid: efficient conjugate addition of thiols to electron deficient alkenes catalyzed by molten tetrabutylammonium bromide under solvent-free conditions
作者:Brindaban C Ranu、Suvendu S Dey、Alakananda Hajra
DOI:10.1016/s0040-4020(03)00289-8
日期:2003.3
An inexpensive and readily available ionic liquid, tetrabutylammonium bromide in the molten state, efficiently catalyzes the conjugateaddition of thiols to α,β-unsaturated nitriles, carboxylic ester, ketones and aldehydes as well as nitro olefins.
Synthesis of fused 1,2,4-thiadiazoles from ω-amino nitriles and thioacyl isothiocyanates
作者:Gerrit L'abbé、Bart D'hooge、Wim Dehaen
DOI:10.1039/p19960000225
日期:——
Fused 1,2,4-thiadiazoles can be prepared in high yields from cyano substituted amines and thiocarbamoyl isothiocyanates by oxidation of the intermediate dithiobiurets.
Thermal decomposition of 2-(cyanoethylthio)benzenediazonium tetrafluoroborate in acetonitrile solution
作者:D. C. Lankin、R. C. Petterson、R. A. Velazquez
DOI:10.1021/jo00932a029
日期:1974.9
WALIA, JASJIT, S.;WALIA, AMRIK, S.;LANKIN, D. C.;PETTERSON, R. C.;SINGH, +, J. HETEROCYCL. CHEM., 1985, 22, N 4, 1117-1119
作者:WALIA, JASJIT, S.、WALIA, AMRIK, S.、LANKIN, D. C.、PETTERSON, R. C.、SINGH, +