作者:Wei-Bo Han、Shao-Gang Li、Xiao-Wei Lu、Yikang Wu
DOI:10.1002/ejoc.201402175
日期:2014.6
A practical method for the conversion of 1,2-disubstituted cyclopropanols derived from Kulinkovich cyclopropanation into linear enones was developed. The approach features regioselective cleavage of the cyclopropane rings in EtOH at ambient temperature with inexpensive and readily available Co(acac)2 as the catalyst and air as the reagent. The crude intermediate peroxides were directly reduced with
开发了一种将 Kulinkovich 环丙烷化衍生的 1,2-二取代环丙醇转化为线性烯酮的实用方法。该方法的特点是在环境温度下使用廉价且容易获得的 Co(acac)2 作为催化剂和空气作为试剂在 EtOH 中区域选择性裂解环丙烷环。粗中间体过氧化物直接用 Ph3P 还原得到相应的 β-羟基酮,通过甲磺酰化和 β-消除,以一锅法进行,仅通过一个色谱步骤就可以提供良好至极好的收率的终产物。整个序列的结束。