A regiospecific route for 1-substituted 3-acyl- and 3-nitro-2-methylthiopyrroles 3a-l and the corresponding 1,2-annulated 3-acylpyrroles 5a-c has been developed by reaction of acyl- and nitroketene S,N-acetals 1a-l and 4a-c with bromoacetaldehyde diethyl acetal in dimethylformamide.
已开发出一种区域选择性合成1-取代的3-酰基-和
3-硝基-
2-甲基噻吩吡咯3a-l及相应的1,2-环化3-酰基
吡咯5a-c的方法,该方法通过在二甲基甲酰胺中将酰基和硝基酮烯S,N-乙酰酸酯1a-l和4a-c与
溴乙醛二乙基乙acetals进行反应实现。