Enantioselective Synthesis of 4-Substituted Dihydrocoumarins through a Zinc Bis(hydroxyamide)-Catalyzed Conjugate Addition of Terminal Alkynes
作者:Gonzalo Blay、M. Carmen Muñoz、José R. Pedro、Amparo Sanz-Marco
DOI:10.1002/adsc.201201120
日期:2013.4.15
A new enantioselective catalyst for the conjugateaddition of terminalalkynes has been developed. Terminalalkynes react with 3‐alkoxycarbonylcoumarins in the presence of diethylzinc and bis(hydroxyamide) ligands to give chiral non‐racemic dihydrocoumarins substituted with an alkynyl group on the C‐4 position with good yields and enantiomeric excesses up to 95%.