Stereospecific Synthesis of Enantioenriched Alkylidenecyclobutanones via Formal Vinylidene Insertion into Cyclopropanone Equivalents
作者:Christopher M. Poteat、Vincent N. G. Lindsay
DOI:10.1021/acs.orglett.1c02303
日期:2021.8.20
equivalents in a formal vinylidene insertion process, providing the first general synthetic route to enantioenriched alkylidenecyclobutanones. The addition of an alkenyl-Grignard reagent leads to an alkenylcyclopropanol capable of electrophilic activation by N-bromosuccinimide, triggering a regio- and stereospecific 1,2-migration and affording alkylidenecyclobutanones after elimination. Activation of the
1-磺酰基环丙醇在这里用作正式的亚乙烯基插入过程中的有效环丙酮等价物,提供了对映体富集的亚烷基环丁酮的第一个通用合成路线。添加烯基-格利雅试剂导致烯基环丙醇能够被N-溴代琥珀酰亚胺亲电激活,触发区域和立体定向 1,2-迁移并在消除后提供亚烷基环丁酮。用其他亲电子试剂(如 HCl 或m CPBA)活化中间体导致通过替代途径形成各种手性环丁酮和 γ-内酯。