Pd(II)/Brønsted Acid Catalyzed Enantioselective Allylic C–H Activation for the Synthesis of Spirocyclic Rings
作者:Zhuo Chai、Trevor J. Rainey
DOI:10.1021/ja2102407
日期:2012.2.29
A Pd(II)/Brønsted acid catalyzed migratory ring expansion for the synthesis of indene derivatives possessing a stereogenic spirocyclic carbon center was developed. This transformation is believed to mechanistically proceed via enantioselective allylic C-H activation with concomitant semipinacol ring expansion to the nascent π-allylpalladium species. Enantioselectivities as high as 98% ee were attainable
开发了 Pd(II)/Brønsted 酸催化的迁移环扩张,用于合成具有立体螺环碳中心的茚衍生物。这种转变被认为是通过对映选择性烯丙基 CH 活化以及伴随的半频哪醇环扩展到新生的 π-烯丙基钯物质而在机械上进行的。可获得高达 98% ee 的对映选择性。