Catalytic enantioselective addition of diethylzinc to aldehydes: Application of a new bicyclic catalyst
摘要:
The optically active beta-amino alcohol (1R,3R,5R)-3-(diphenylhydroxymethyl)-2-azabicyclo[3.3.0]octane (1R,3R,5R)-1 derived from a bicyclic proline analogue catalyzes the enantioselective addition of diethylzinc to various aldehydes. The resulting chiral secondary alcohols are obtained in high optical yields up to 100 % under mild reaction conditions. The bicyclic catalyst gives much better results than the corresponding (S)-proline derivative (S)-4.