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 methyl 3-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
描述了在
三乙胺存在下,通过3-烷
氧基-2-芳基(或
甲基)磺酰基
丙烯腈与
硫代
乙醇酸甲
酯的反应,合成一系列3-
氨基-4-芳基(或
甲基)磺酰基
噻吩-2-羧酸甲酯。
酯在2-位的
水解/
脱羧和所得胺的酰化代表了形成4-芳基磺酰基-3-羧
酰胺基
噻吩的便利途径。在标准条件下尝试酰化标题
氨基
噻吩未成功。