Enantioconvergent Synthesis of (+)-Aphanorphine via Asymmetric Pd-Catalyzed Alkene Carboamination
作者:Duy N. Mai、Brandon R. Rosen、John P. Wolfe
DOI:10.1021/ol2009895
日期:2011.6.3
concise asymmetric synthesis of (+)-aphanorphine has been achieved via a new enantioconvergent strategy. A racemic γ-aminoalkene derivative is transformed into a 1:1 mixture of enantiomerically enriched diastereomers using an asymmetric Pd-catalyzed carboamination. This mixture is then converted to an enantiomerically enriched protected aphanorphine derivative by a Friedel–Crafts reaction, which generates
(+)-aphanorphine 的简洁不对称合成已通过新的对映收敛策略实现。使用不对称 Pd 催化的碳胺化作用,将外消旋 γ-氨基烯烃衍生物转化为 1:1 对映异构体富集的非对映异构体混合物。然后通过 Friedel-Crafts 反应将该混合物转化为对映异构体富集的受保护的阿啡诺啡衍生物,该反应生成四元全碳立体中心。天然产物是通过三个额外的步骤获得的。