Hydrogen-Bond-Directed Formal [5 + 1] Annulations of Oxindoles with Ester-Linked Bisenones: Facile Access to Chiral Spirooxindole δ-Lactones
作者:Shuai Zhao、Jun-Bing Lin、Yuan-Yuan Zhao、Yong-Min Liang、Peng-Fei Xu
DOI:10.1021/ol500547e
日期:2014.3.21
A novel bifunctional thiourea catalyzed formal [5 + 1] cycloaddition of oxindoles and ester-linked bisenones was successfully developed. This strategy involves two sequential Michael additions, leading to spirooxindole δ-lactones with three contiguous stereocenters including an all-carbon quaternary center with high diastereo- and enantioselectivites. In addition, a remarkable N-substituent effect
一种新型的双功能硫脲催化了羟吲哚和酯连接的双硒酮的正式[5 +1]环加成反应。该策略涉及两个连续的迈克尔加成,从而产生具有三个连续立体中心的螺环吲哚δ-内酯,包括具有高非对映体和对映体选择性的全碳四元中心。另外,在反应性和选择性上观察到了显着的N-取代作用。