Organocatalytic stereocontrolled synthesis of 3,3′-pyrrolidinyl spirooxindoles by [3+2] annulation of isocyanoesters with methyleneindolinones
作者:Liang-Liang Wang、Jian-Fei Bai、Lin Peng、Liang-Wen Qi、Li-Na Jia、Yun-Long Guo、Xi-Ya Luo、Xiao-Ying Xu、Li-Xin Wang
DOI:10.1039/c2cc30746d
日期:——
A stereoselective [3+2] cycloaddition of isocyanoesters to methyleneindolinones catalyzed by a quinine-based thiourea-tertiary amine has been successfully developed. Just by tuning the protecting groups on substrates, a variety of optically enriched 3,3'-pyrrolidinyl spirooxindole diastereomers could be obtained in excellent enantioselectivities (up to 99% ee).