作者:S. Carlsson、S.-O. Lawesson
DOI:10.1016/0040-4020(82)80183-x
日期:1982.1
the enaminones 4a–4e by the following two routes: (A): Acylation of the enamines, 2, derived from 1 and secondary amines (pyrrolidine, morpholine and piperidine) by ethyl chloroformate, and (B): Condensation of 1 with diethyl oxalate, giving the β-ketoesters 3, followed by reaction with the secondary amines. Ethyl 2(-1-pyrrolidinyl)-1-cyclopentene-1-carboxylate, 4f, and methyl 3-(1-pyrrolidinyl)-2-butenoate
环己酮2-甲基-环己酮和4-甲基-环己酮1通过以下两种途径转化为烯胺4a-4e:(A):烯胺2的酰化,衍生自1和仲胺(吡咯烷, (B):将1与草酸二乙酯缩合,得到β-酮酸酯3,然后与仲胺反应。2-(-1-吡咯烷基)-1-环戊烯-1-羧酸乙酯4f和3-(1-吡咯烷基)-2-丁烯酸甲酯4g分别由2-氧代-1-环戊烷甲酸乙酯和3-氧代-丁酸乙酯与吡咯烷缩合制备。通过LAH还原4a,得到的1-环己烯-1-甲醛5a,1-环己烯-1-甲醇6a和1-(1-环己烯-1-甲基)吡咯烷7a的收率取决于其摩尔比LAH / 4a。通过LAH还原4f,得到环戊烯-1-甲醇6b,1-(1-环戊烯-1-甲基)吡咯烷7b和2(1-吡咯烷基)-1-环戊烷甲酸乙酯8b。用LAH还原时,化合物4g生成3-(1-吡咯烷基)丁酸甲酯8c(主要产物)和1-(2-丁烯基)吡咯烷7c(未成年人)。的还原4加入NaBH 4只得到饱和β氨基酯,8以高收率。LAH和NaBH