The direct preparation of functionalised cyclopropanes from allylic alcohols or α-hydroxyketones using tandem oxidation processes
作者:Graeme D. McAllister、Magalie F. Oswald、Richard J. Paxton、Steven A. Raw、Richard J.K. Taylor
DOI:10.1016/j.tet.2005.12.078
日期:2006.7
carried out in the presence of a stabilised sulfurane, and the intermediate α,β-unsaturated carbonyl compound undergoes in situ cyclopropanation. By using a combination of stabilised phosphorane and sulfurane, the direct conversion of allylic alcohols or α-hydroxyketones into functionalised cyclopropanes is achieved, with in situ cyclopropanation being followed by Wittig olefination, or vice versa. The
已经开发了新的二氧化锰介导的串联氧化工艺(TOP),其有助于将烯丙基醇和α-羟基酮直接转化成多取代的官能化的环丙烷。在最简单的形式中,烯丙基醇的氧化在稳定的硫烷存在下进行,并且中间体α,β-不饱和羰基化合物进行原位环丙烷化。通过使用稳定的phosphor烷和硫烷的组合,可以将烯丙醇或α-羟基酮直接转化为官能化的环丙烷,在原位环丙烷化之后进行Wittig烯烃化反应,反之亦然。描述了这些方法在木脂素(±)-鬼臼苦素的正式合成中以及在杀虫剂Allethrin II的新类似物中的应用。