Cyclocarbonylation of Bicyclic Vinylcyclopropanes – Selective Generation of Seven‐Membered Enones
作者:Matthias M. Schulze、Ulrich Gockel
DOI:10.1002/cber.19971300926
日期:1997.9
The cyclic vinylcyclopropane 6a reacts at elevated temperatures with iron pentacarbonyl to selectively give the enone 7a in 52% yield. Reducing the reaction time provided the isomeric ketones 7a–b. Partial chromatographic separation of this mixture allowed the complete spectroscopic identification of 7b by 1H NMR. The structure of 7c was determined from selected spectral data of the mixture of 7a and
环状乙烯基环丙烷6a在升高的温度下与五羰基铁反应,以52%的收率选择性地产生烯酮7a。减少反应时间提供了异构体酮7a – b。通过部分色谱分离该混合物,可以通过1 H NMR对7b进行完整的光谱鉴定。根据7a和7c混合物的选定光谱数据确定7c的结构。为了比较,将甲基取代的衍生物6b在上述条件下进行羰基化,仅提供8ini 42%的收率。提出了两种不同模式的开环的机械原理。