Organocatalytic asymmetric synthesis of trans -configured trispirooxindoles through a cascade Michael-cyclization reaction
作者:Chaoling Wu、Linhai Jing、Dabin Qin、Mingxing Yin、Qiuzuo He
DOI:10.1016/j.tetlet.2016.05.056
日期:2016.6
stereoselective Michael-cyclization reaction of 3-isothiocyanato oxindoles to cyclic methyleneindolinones has been described. The protocol provides a facile and efficient access to chiral trans-configured trispirooxindoles containing two quaternary stereocenters in good yields (up to 89%) with good diastereoselectivities (up to 90:10) and high enantioselectivities (up to 94% ee) under mild conditions