Highly Enantioselective Addition of Enals to Isatin-Derived Ketimines Catalyzed by N-Heterocyclic Carbenes: Synthesis of Spirocyclic γ-Lactams
作者:Hui Lv、Bhoopendra Tiwari、Junming Mo、Chong Xing、Yonggui Robin Chi
DOI:10.1021/ol302475g
日期:2012.11.2
An N-heterocycliccarbene (NHC)-catalyzed annulation reaction of isatin N-Boc ketimines and enals is developed for the synthesis of spirocyclic oxindole-γ-lactams bearing one quaternary chiral center in good yields and excellent stereoselectivities (up to >20:1 dr and 99% ee).