Reaction of Polarized Ketene<i>S,N</i>-Acetals with Bromoacetaldehyde Diethyl Acetal: Synthesis of 1-Substituted 3-Acyl- and 3-Nitro-2-methylthiopyrroles and 1,2-Annulated 3-Acylpyrroles
作者:Akhilesh K. Gupta、R. T. Chakrasali、H. Ila、H. Junjappa
DOI:10.1055/s-1989-27179
日期:——
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。