Synthesis of methyl 3-amino-4-aryl(or methyl)sulfonyl-2-thiophenecarboxylates from 3-alkoxy-2-aryl(or methyl)-sulfonylacrylonitriles
作者:Chad E. Stephens、Matthew B. Price、J. Walter Sowell
DOI:10.1002/jhet.5570360314
日期:1999.5
The synthesis of a series of methyl3-amino-4-aryl(or methyl)sulfonylthiophene-2-carboxylates by reaction of 3-alkoxy-2-aryI(or methyl)sulfonylacrylonitriles with methyl thioglycolate in the presence of triethylamine is described. Hydrolysis/decarboxylation of the ester at the 2-position and acylation of the resulting amine represents a convenient route to 4-arylsulfonyl-3-carboxamidothiophenes. Attempted
Three-component condensation of 3-aminothiophene-2-carboxylic acid derivatives with aldehydes and Meldrum’s acid
作者:B. V. Lichitsky、R. M. Belyi、A. N. Komogortsev、A. A. Dudinov、M. M. Krayushkin
DOI:10.1007/s11172-010-0020-8
日期:2009.2
A convenient method was developed for the synthesis of the previously unknown substituted 6,7-dihydro-4H-thieno[3,2-b]pyridin-5-ones based on the three-component condensation of 3-aminothiophenes, Meldrum’s acid, and aromatic aldehydes. 3-Aminothiophenes are easily formed in situ by decarboxylation of 3-aminothiophene-2-carboxylic acids in an acidic medium. Sodium salts of the latter acids were prepared