Design, Synthesis, and Application of a Chiral Sulfinamide Phosphine Catalyst for the Enantioselective Intramolecular Rauhut-Currier Reaction
作者:Xiao Su、Wei Zhou、Yangyan Li、Junliang Zhang
DOI:10.1002/anie.201500907
日期:2015.6.1
A novel class of chiral sulfinamide phosphine catalysts (Xiao‐Phos) are reported, which can be easily prepared from inexpensive commercially available starting materials. The Xiao‐Phos catalysts showed good performance in enantioselectiveintramolecular Rauhut–Currier reactions, generating α‐methylene‐γ‐butyrolactones in high yields with up to 99 % ee under mild conditions. Moreover, kinetic resolution
commercially available aldehyde and chiral tert-butanesulfinamide, a series of chiral sulfinamide phosphines (Xiao-Phos) were synthesized via a two-step condensation-nucleophilic addition procedure. In most cases, nucleophilic addition of the N-tert-butanesulfinyl imine with diphenyl methyl phosphonic lithium showed high diastereoselectivity (d.r>20:1) with BF3 as additives. Following removal of the chiral