A More Comprehensive and Highly Practical Solution to Enantioselective Aldehyde Crotylation
摘要:
The enantioselective crotylation of aldehydes with 1,2-diaminochlorocrotylsilane reagents is effectively catalyzed by Sc(OTf)(3). The one significant limitation on the utility of these reagents - substrate scope - has thus been addressed. The net result is the most comprehensive and highly practical method for enantioselective aldehyde crotylation yet advanced.
Catalytic Asymmetric Synthesis of Complex Polypropionates: Lewis Base Catalyzed Aldol Equivalents in the Synthesis of Erythronolide B
作者:Binita Chandra、Dezhi Fu、Scott G. Nelson
DOI:10.1002/anie.200906245
日期:2010.3.29
Powerful aldol reactions: Stereoselective Lewis base catalyzed aldolequivalents expediently provided eight of the ten stereocenters required for the synthesis of erythronolide B. Indeed, all eleven stereocenters present in the erythromycin aglycone have been derived directly or indirectly from catalyticasymmetricequivalents of aldol addition reactions (see scheme).