Asymmetric Addition of Chiral 1,3,2-Benzoxazaphosphinine 2-Oxides to Aldehydes: Diastereoselective Synthesis of α-Substituted β-Hydroxyphosphonic Acids
作者:Beatriz López、Alicia Maestro、Rafael Pedrosa
DOI:10.1002/ejoc.200601102
日期:2007.6
The addition of stabilized phosphorus anions to aldehydes leads to α-substituted β-hydroxyphosphonates. The diastereoselectivity of the process is strongly influenced by the substitution of the phosphorus atom. Whereas P-ethyl derivatives provide a mixture of three isomers, the presence of a benzyl group enhances the stereocontrol, providing two diastereomers in ratios of up to 5:1. Elimination of