Addition of organocopper reagents to allylic acrylates — the preparation of γ, δ-unsaturated acids and subsequent functionalization to γ-lactones
作者:Magnus Eriksson、Anders Hjelmencrantz、Martin Nilsson、Thomas Olsson
DOI:10.1016/0040-4020(95)00804-h
日期:1995.11
Conjugate addition of monoorganocopper compounds with iodotrimethylsilane (TMSI) or lithium diorganocuprates, with or without halosilanes, to allylic acrylates give allylic silyl ketene acetals/ester enolates. These can undergo Claisen rearrangement to give diastereomeric mixtures of γ, δ-unsaturated acids after aqueous work-up. For organocuprates, the diastereomeric ratio is strongly affected by the
将单有机铜化合物与碘化三甲基硅烷(TMSI)或二有机铜酸锂(有或没有卤代硅烷)共轭添加到烯丙基丙烯酸酯中,得到烯丙基甲硅烷基烯酮缩醛/酯烯酸酯。这些可以进行克莱森重排,以在水性处理后得到γ,δ-不饱和酸的非对映异构体混合物。对于有机铜酸盐,非对映体比率受卤硅烷的强烈影响。非对映体或者可作为主要产物由铜试剂的适当选择而获得。酸环化后还原,可得到高收率的γ-内酯。碘化亚铜/二甲基硫醚络合物作为有机铜试剂的极佳前体被引入。