Carbazolothiophene-2-carboxylic acid derivatives as endothelin receptor antagonists
摘要:
The SmI2-promoted three-component coupling reaction of thiophene-2-carboxylate, indole-2-carbaldehyde and acetophenone provides an expedient route to a series of tetracyclic carbazolothiophene compounds bearing the indole and thiophene rings. Among these samples, 9-benzyl-4-methyl-4-(4-hydroxyphenyl)-10-oxo-4,10-dihydrocarbazolo[2,3-b]thiophene-2-carboxylic acid (18) shows the most potent inhibition against the endothelin-1 induced increase of intracellular calcium ion concentration. (C) 2003 Elsevier Ltd. All rights reserved.
The SmI2-promoted three-component coupling reaction of thiophene-2-carboxylate, indole-2-carbaldehyde and acetophenone provides an expedient route to a series of tetracyclic carbazolothiophene compounds bearing the indole and thiophene rings. Among these samples, 9-benzyl-4-methyl-4-(4-hydroxyphenyl)-10-oxo-4,10-dihydrocarbazolo[2,3-b]thiophene-2-carboxylic acid (18) shows the most potent inhibition against the endothelin-1 induced increase of intracellular calcium ion concentration. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis of polycyclic and 4,5-diacylthiophene-2-carboxylates via intramolecular Friedel–Crafts alkylations and unusual autooxidative fragmentation of the derivatives obtained from the samarium diiodide-promoted coupling reactions of thiophene-2-carboxylate with carbonyl compounds
作者:Shyh-Ming Yang、Jim-Min Fang
DOI:10.1016/j.tet.2006.11.080
日期:2007.2
Our present study provides an expedient method for the synthesis of novel polycyclic and multi-substituted thiophene derivatives. A series of 4,5-di(hydroxyalkyl)-4,5-dihydrothiophene-2-carboxylates (e.g., 4a–c and 10) were prepared by the SmI2-promoted three-component coupling reactions of thiophene-2-carboxylate with aromatic aldehydes and 4-methoxyacetophenone. Diol 4a was oxidized by DDQ or pyridinium