Organocatalytic Enantioconvergent Synthesis of Tetrasubstituted Allenes via Asymmetric 1,8-Addition to aza-<i>para</i>-Quinone Methides
作者:Min Chen、Deyun Qian、Jianwei Sun
DOI:10.1021/acs.orglett.9b03224
日期:2019.10.4
In contrast to the well-explored quinone methides (QMs) and aza-ortho-QMs, aza-para-QMs have been rarely studied in terms of their asymmetric transformations. Herein, a highly efficient enantioconvergent asymmetric 1,8-addition of aza-para-QMs is described. Featuring remarkable remote stereocontrol, this reaction provides expedient access to chiral tetrasubstituted allenes bearing an adjacent all-carbon
与开发良好的醌甲基化物(QMs)和氮杂邻-QMs相比,对氮杂-对-QMs的不对称转化研究很少。在此,描述了氮杂-对-QM的高效对映收敛的不对称1,8-加成。该反应具有出色的远程立体控制功能,可以方便地接近带有对映体选择性和非对映体选择性的,相邻的全碳四元立体中心的手性四取代的烯。