Asymmetric Propargylation of Ketones Using Allenylboronates Catalyzed by Chiral Biphenols
作者:David S. Barnett、Scott E. Schaus
DOI:10.1021/ol201535b
日期:2011.8.5
Chiralbiphenolscatalyze the enantioselective asymmetric propargylation of ketones using allenylboronates. The reaction uses 10 mol % of 3,3′-Br2-BINOL as the catalyst and allenyldioxoborolane as the nucleophile, in the absence of solvent, and under microwave irradiation to afford the homopropargylic alcohol. The reaction products are obtained in good yields (60–98%) and high enantiomeric ratios (3:1–99:1)