A Samarium(II)-Mediated, Stereoselective Cyclization for the Synthesis of Azaspirocycles
作者:Giuditta Guazzelli、Lorna A. Duffy、David J. Procter
DOI:10.1021/ol8017209
日期:2008.10.2
Unsaturated keto-lactams undergo sequential conjugate reduction-aldol cyclization on treatment with SmI 2 to give syn-spirocyclic pyrrolidinones and piperidinones containing vicinal, fully substituted stereocenters with complete diastereocontrol. The substituent on nitrogen and the lactam ring size have a marked impact on the efficiency of the spirocyclization.