Catalytic Asymmetric Intramolecular Homologation of Ketones with α-Diazoesters: Synthesis of Cyclic α-Aryl/Alkyl β-Ketoesters
作者:Wei Li、Fei Tan、Xiaoyu Hao、Gang Wang、Yu Tang、Xiaohua Liu、Lili Lin、Xiaoming Feng
DOI:10.1002/anie.201409572
日期:2015.1.26
A catalytic asymmetric intramolecular homologation of simple ketones with α‐diazoesters was firstly accomplished with a chiral N,N′‐dioxide–Sc(OTf)3 complex. This method provides an efficient access to chiral cyclic α‐aryl/alkyl β‐ketoesters containing an all‐carbon quaternary stereocenter. Under mild conditions, a variety of aryl‐ and alkyl‐substituted ketone groups reacted with α‐diazoester groups
首先用手性N,N'-二氧化物-Sc(OTf)3配合物完成了简单的酮与α-重氮化合物的催化不对称分子内同源性。这种方法可以有效地获得含有全碳季立体中心的手性环状α-芳基/烷基β-酮酸酯。在温和的条件下,各种芳基和烷基取代的酮基通过分子内加成/重排过程与α-重氮酸酯基团平稳反应,从而以高收率和对映体过量生成β-酮酸酯。