Stereo- and regioselectivity of cyclization reactions in conformationally restricted epoxy ketones: evaluation of C- versus O-alkylation process
作者:Paolo Crotti、Fabrizio Badalassi、Valeria Di Bussolo、Lucilla Favero、Mauro Pineschi
DOI:10.1016/s0040-4020(01)00817-1
日期:2001.10
The intramolecular addition reaction of metal enolates of ketones to oxiranes has been applied to a series of epoxy ketones derived from cyclohexene oxide. γ-Hydroxy ketones (γ-HKs, C-alkylation products) or hydroxy enol ethers (HEEs, O-alkylation products) are obtained, depending on the nature of the cyclic transition state in each case involved and the application of the Fürst–Plattner rule. The
酮的金属烯醇化物与环氧乙烷的分子内加成反应已应用于一系列衍生自环己烯氧化物的环氧酮。根据每种情况下涉及的环状过渡态的性质以及Fürst-Plattner的应用,可获得γ-羟基酮(γ-HKs,C-烷基化产物)或羟基烯醇醚(HEEs,O-烷基化产物)规则。还描述了通过相同的环氧酮在酸性条件下反应形成的HEE。在某些情况下,可以方便地获得区域会聚或化学选择性过程。