Gram-Scale Enantioselective Formal Synthesis of Morphine through an<i>ortho</i>-<i>para</i>Oxidative Phenolic Coupling Strategy
作者:Matthieu Tissot、Robert J. Phipps、Catherine Lucas、Rafael M. Leon、Robert D. M. Pace、Tifelle Ngouansavanh、Matthew J. Gaunt
DOI:10.1002/anie.201408435
日期:2014.12.1
catalytic enantioselective formal synthesis of morphine is described. The key steps of the synthesis involve an ortho–para oxidative phenolic coupling and a highly diastereoselective “desymmetrization” of the resulting cyclohexadienone that generates three of the four morphinan ring junction stereocenters in one step. The stereochemistry is controlled from a single carbinol center installed through catalytic
描述了吗啡的克级催化对映选择性形式合成。合成的关键步骤涉及邻-对氧化酚醛偶联和生成的环己二酮的非对映选择性“去对称化”,该环己二酮在一个步骤中生成四个吗啡喃环结立体中心中的三个。从通过催化对映选择性氢化而安装的单个甲醇中心控制立体化学。这些转化使大量关键中间体的制备成为可能,并可以支持实用且可扩展的吗啡及其相关衍生物的合成。