Silylcuprates from Allene and Their Reaction with α,β-Unsaturatedd Nitriles and Imines. Synthesis of Silylated Oxo Compounds Leading to Cyclopentane and Cycloheptane Ring Formation
作者:Asunción Barbero、Yolanda Blanco、Francisco J. Pulido
DOI:10.1021/jo0509814
日期:2005.8.1
silylcupration of allenes and the subsequent capture of the intermediate cuprate with α,β-unsaturated nitriles is reported. The influence of the substitution of the nitrile, the nature of the silylcopper species, and the temperature on the selectivity of the reaction is studied. An interesting diaddition process was observed (1,2-addition and 1,4-addition), leading to oxo compounds which simultaneously have an allylsilane
报道了丙二烯的甲硅烷基化和随后用α,β-不饱和腈捕获中间铜酸盐。研究了腈的取代,甲硅烷基铜物种的性质以及温度对反应选择性的影响。观察到一个有趣的二加成过程(1,2-加成和1,4-加成),导致同时具有烯丙基硅烷基和乙烯基硅烷基的氧代化合物。这两个单元的分子内烯丙基硅烷封端的环化反应已采用了这两个单元的不同反应性,其中乙烯基硅烷部分保持不变。为了阐明反应途径,还研究了α,β-不饱和亚胺的行为,并提出了一种新的方便的环庚烷环化方法。