Regio- and Stereocontrolled Synthesis of 3-Substituted 1,2-Diazetidines by Asymmetric Allylic Amination of Vinyl Epoxide
作者:Sundaram Rajkumar、Guy J. Clarkson、Michael Shipman
DOI:10.1021/acs.orglett.7b00653
日期:2017.4.21
Pd-catalyzed asymmetric allylic amination of rac-vinyl epoxide with unsymmetrical 1,2-hydrazines proceeds with excellent regio- and stereocontrol, which after further ring closure provides differentially protected 3-vinyl-1,2-diazetidines in good yields. The chirality at C-3 exerts stereocontrol over the nitrogen centers in the 1,2-diazetidine with all substituents orientating themselves trans to their
钯催化外消旋-乙烯基环氧化物与不对称1,2-肼的不对称烯丙基胺化反应具有出色的区域和立体控制能力,在进一步闭环后,可以提供收率差的受保护的3-乙烯基-1,2-二氮杂环丁烷。在C-3上施加手性立体控制过在1,2-二氮杂环丁烷氮的中心与所有的取代基自身定向反式到其邻居。证明了有效的官能化而不会断裂的环断裂(例如,通过交叉复分解),从而建立了对映体富集形式的C-3取代的1,2-二氮杂环丁烷的第一个通用路线。