Alkylation of 4-substituted 1-acetoxy-2-cyclopentenes by using copper reagents derived from alkylmagnesium halides and copper(I) cyanide
作者:Yuichi Kobayashi、Michiko Ito、Junji Igarashi
DOI:10.1016/s0040-4039(02)00915-2
日期:2002.7
Abstract Alkylation of the acetates derived from 4-phenyl- and 4-butyl-2-cyclopenten-1-ols 2 was investigated with copper reagents derived from n -BuMgX (X=Cl, Br) and CuCN in 2:1 and 1:1 ratios in THF and in Et 2 O. cis 1,4-Isomers 4a , b (R=Ph, n -Bu) were produced regioselectively from the corresponding trans acetates 3a , b with the reagent in a 2:1 ratio of BuMgCl and CuCN in THF, while the BuMgBr-based
摘要 用衍生自 n-BuMgX (X=Cl, Br) 和 CuCN 的铜试剂在 2:1 和 1 中研究了衍生自 4-苯基和 4-丁基-2-环戊烯-1-醇 2 的乙酸酯的烷基化反应: 1 THF 和 Et 2 O. 顺式 1,4-异构体 4a , b (R=Ph, n -Bu) 由相应的反式乙酸酯 3a , b 区域选择性地产生,试剂以 2:1 的 BuMgCl 比和 CuCN 在 THF 中,而在 Et 2 O 中比例为 2:1 和 1:1 的 BuMgBr 基试剂提供顺式 3,4-异构体 5a 和 b。使用顺式乙酸酯 6a、b (R=Ph, n -Bu) 获得了类似的趋势。