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。