Pd(II)-Catalyzed Asymmetric Annulation toward the Synthesis of 2,3-Disubstituted Chiral Indenols

J Org Chem. 2020 Mar 6;85(5):3887-3893. doi: 10.1021/acs.joc.9b02958. Epub 2020 Jan 30.

Abstract

An enantioselective asymmetric annulation of 2-formylboronic acids with internal alkynes has been realized using a chiral phosphinooxazoline/palladium(II) catalyst. The reaction tolerates a variety of alkynes including the relatively inert diaryl substituted internal ones. A wide range of optically active 2,3-disubstituted indenols was afforded in high yields with good to excellent enantioselectivities (up to 99% yield and 99% ee).

Publication types

  • Research Support, Non-U.S. Gov't