Synthesis of Pyrrolidines and Pyrrolizidines with α-Pseudoquaternary Centers by Copper-Catalyzed Condensation of α-Diazodicarbonyl Compounds and Aryl γ-Lactams
作者:Sébastien Goudedranche、Céline Besnard、Léo Egger、Jérôme Lacour
DOI:10.1002/anie.201607574
日期:2016.10.24
usually dicarbonyl compounds, in a copper‐catalyzed process to yield functionalized pyrrolidines with α‐pseudoquaternary centers. As 1,2‐acyl or ‐phosphoryl migration is preferred, single regioisomers are obtained. Furthermore, in the presence of a Lewis acid, subsequent Friedel–Crafts reactions yield tricyclic pyrrolizidines in excellent yields (90–96 %) and diastereoselectivities (up to >20:1).
N-芳基γ-内酰胺在铜催化的过程中与受体-重氮试剂(通常为二羰基化合物)发生分子间反应,生成具有α-伪四元中心的官能化吡咯烷。由于首选1,2-酰基或-磷酰基迁移,因此获得了单一的区域异构体。此外,在路易斯酸的存在下,随后的Friedel-Crafts反应以极好的收率(90–96%)和非对映选择性(> 20:1)生成三环吡咯并核苷。