Stereoselective Synthesis of<i>trans</i>-2,3-Disubstituted 5-Amino-4-cyano-2,3-dihydrothiophenes
作者:A. M. Shestopalov、O. P. Bogomolova、V. P. Litvinov
DOI:10.1055/s-1991-26445
日期:——
Interaction of 1-(1-adamantylcarbonylmethyl)pyridinium bromide (1) with arylmethylenecyanothioacetamides 2 proceeds stereoselectively with formation of 2-(1-adamantylcarbonyl)-5-amino-3-aryl-4-cyano-2,3-dihydrothiophenes. Dihydrothiophenes were obtained in a good yield by three-component condensation of pyridinium bromide 1, aldehydes and cyanothioacetamide in presence of triethylamine.
1-(1-金刚烷基羰基甲基)溴化吡啶鎓(1)与芳基亚甲基硫代氰乙酰胺 2 相互作用,立体选择性地生成 2-(1-金刚烷基羰基)-5-氨基-3-芳基-4-氰基-2,3-二氢噻吩。 在三乙胺存在下,通过溴化吡啶鎓 1、醛类和硫代氰乙酰胺的三组分缩合,可以获得收率很高的二氢噻吩。