Unstabilized Azomethine Ylides for the Stereoselective Synthesis of Substituted Piperidines, Tropanes, and Azabicyclo[3.1.0] Systems
作者:Michael A. Ischay、Michael K. Takase、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/ja312311k
日期:2013.2.20
azomethine ylides that can (1) be protonated and reduced with high stereoselectivity to give piperidines, (2) participate in [3 + 2] dipolar cycloaddition to give tropanes, and (3) undergo a Nazarov-like 6-π electrocyclization that upon reduction give 2-azabicyclo[3.1.0] systems.
密集取代的 2-甲硅烷基-1,2-二氢吡啶的酸处理为反应性偶氮甲碱叶立德提供了一种新的方便的入口,可以 (1) 以高立体选择性质子化和还原得到哌啶,(2) 参与 [3 + 2]偶极环加成得到托烷,和 (3) 经历类似纳扎罗夫的 6-π 电环化,还原后得到 2-氮杂双环 [3.1.0] 系统。