A Facile and Convenient Synthesis of 3-Alkylamino-5-arylthiophenes with a Variety of Substituents at C-2 and Studies of Reaction Mechanisms
作者:Bo Sung Kim、Kyongtae Kim
DOI:10.1021/jo991884b
日期:2000.6.1
Thioaroylketene S,N-acetals were treated with active methylene compounds including beta-keto ester, nitromethane, cyanoacetic acid, p-toluenesulfonylacetone, 4-nitrophenylacetic acid, and diethyl (2-oxopropyl)phosphonate in the presence of mercury(II) acetate in CH(2)Cl(2) at room temperature. These reactions gave 3-alkylamino-5-arylthiophenes containing various substituents, which comprised, respectively
在乙酸汞(II)的存在下,用活性亚甲基化合物(包括β-酮酸酯,硝基甲烷,氰基乙酸,对甲苯磺酰基丙酮,4-硝基苯乙酸和4-乙基苯基乙酸)处理亚硫酰芳基烯酮S,N-缩醛。 CH(2)Cl(2)在室温下。这些反应以良好的收率得到了含有各种取代基的3-烷基氨基-5-芳基噻吩,这些取代基分别在C-2上包含烷氧羰基,硝基,氰基,对甲苯磺酰基,4-硝基苯基和二乙基膦酰基。在相同条件下,使3-甲基氨基-3-甲基硫基-1-苯基硫代丙烯与丙二酸或Meldrum酸反应,得到3-甲基氨基-5-苯基噻吩。同样地,使用各种可烯丙基环酮(例如4-羟基-6-甲基-2-吡喃酮)处理3-甲基氨基-3-甲基硫基-1-苯基硫代丙烯,