Enantioselective Multicomponent Condensation Reactions of Phenols, Aldehydes, and Boronates Catalyzed by Chiral Biphenols
作者:Keith S. Barbato、Yi Luan、Daniele Ramella、James S. Panek、Scott E. Schaus
DOI:10.1021/acs.orglett.5b02954
日期:2015.12.4
Chiral diols and biphenolscatalyze the multicomponent condensation reaction of phenols, aldehydes, and alkenyl or aryl boronates. The condensation products are formed in good yields and enantioselectivities. The reaction proceeds via an initial Friedel–Crafts alkylation of the aldehyde and phenol to yield an ortho-quinone methide that undergoes an enantioselectiveboronateaddition. A cyclization