Catalytic enantioselective synthesis of macrolides via asymmetric alkylation
摘要:
Catalytic enantioselective syntheses of the macrolides (R)-(-) phoracantholide and (R)-(+) lasiodiplodin have been achieved. Stereochemistry was introduced in using an arene chromium tricarbonyl derived catalyst, which mediated the enantioselective addition of dimethyl zinc to a functionalized aldehyde. (C) 1997 Elsevier Science Ltd.
Catalytic asymmetric induction Part 2. Chiral tricarbonyl (η6 arene) chromium (0) complexes as enantioselective catalysts
摘要:
A chiral metallocyclic Lewis acid based catalyst system derived from norephedrine is reported. A key stereodirective element emanates from a tricarbonyl chromium (0) group complexed to the aryl ring. The catalysts mediate the addition of dialkyl zinc species to a variety of aldehydes with high enantioselectivity.