Asymmetric Aldol Reaction Catalyzed by a Heterogenized Proline on a Mesoporous Support. The Role of the Nature of Solvents
作者:Elisa G. Doyagüez、Félix Calderón、Félix Sánchez、Alfonso Fernández-Mayoralas
DOI:10.1021/jo070992s
日期:2007.11.1
heterogenized (S)-proline on mesoporoussupport MCM-41 catalyzes the asymmetricaldolreaction in a wide range of solvents. The progress of the reaction is dependent on the nature of the solvent. Reactions proceed more efficiently in hydrophilic polar solvents; however, the addition of a small amount of water has a positive effect on the rate and the stereoselectivity of the reaction performed in hydrophobic
Synthesis of Azasugars through a Proline-Catalyzed Reaction
作者:Félix Calderón、Elisa G. Doyagüez、Alfonso Fernández-Mayoralas
DOI:10.1021/jo060568b
日期:2006.8.1
We report an efficient route to obtain azasugars from the enantiomerically pure l- and d-diethyltartrate. The key step is a proline-catalyzed aldol condensation, in which both enantiomers of proline have been used as catalyst, affording complementary anti-aldol products.