Enantio- and diastereoselective hetero-Diels–Alder reactions between 2-aza-3-silyloxy-1,3-butadienes and aldehydes catalyzed by chiral dirhodium(ii) carboxamidates
Enantio- and diastereoselective hetero-Diels–Alder reactions between 2-aza-3-silyloxy-1,3-butadienes and aldehydes catalyzed by chiral dirhodium(ii) carboxamidates
Catalytic, enantioselective acetate aldol additions to α,β-ynals: Preparation of optically active propargylic alcohols
作者:Robert A. Singer、Mary S. Shepard、Erick M. Carreira
DOI:10.1016/s0040-4020(98)00344-5
日期:1998.6
A catalytic, enantioselective acetate-aldol addition reaction of silyl ketene acetals with α,β-ynals and 3 mol % of a chiral Ti(IV) complex is described. This process provides access to opticallyactive β-hydroxy-γ-alkynyl esters in 84–96% yields and 94–97% ee's.