Simple organocatalyst component system for asymmetric hetero Diels–Alder reaction of isatins with enones†
Perumalsamy Parasuraman,Zubeda Begum,Madhu Chennapuram,Chigusa Seki,Yuko Okuyama,Eunsang Kwon,Koji Uwai,Michio Tokiwa,Suguru Tokiwa,Mitsuhiro Takeshita,Hiroto Nakano
RSC Advances Pub Date : 05/05/2020 00:00:00 , DOI:10.1039/D0RA03006F
Abstract

A simple two catalyst component system consisting of primary β-amino alcohols as a catalyst and amino acids as a co-catalyst put together works as an efficient organocatalyst system in the hetero Diels–Alder reaction of isatins with enones to afford the chiral spirooxindole–tetrahydropyranones in good chemical yields and stereoselectivities (up to 86%, up to 85 : 15 dr., up to 95% ee).

Graphical abstract: Simple organocatalyst component system for asymmetric hetero Diels–Alder reaction of isatins with enones