Gloria Reyes-Rangel, Virginia Marañón, C. G. Avila-Ortiz
Aug 28, 2006
Citations
0
Influential Citations
14
Citations
Journal
Tetrahedron
Abstract
Abstract N-Acylation of readily available, enantiopure oxazolidinone (4R,5R)-1b with (diethoxyphosphoryl)propionyl chloride and (diethoxyphosphoryl)butanoyl chloride affords de title substrates (4R,5R)-2 and (4R,5R)-7, respectively, which are azidated with high diastereoselectivity by means of the reaction between their sodium enolates (4R,5R)-2-Na and (4R,5R)-7-Na with trisyl azide. Removal of the chiral auxiliary from azidated products (4R,5R,2′S)-3 and (4R,5R,2′R)-8 followed by hydrogenation and hydrolysis of the resulting carboxylic acids (S)-4 and (R)-9 gave the pharmacologically relevant aminophosphonic acids (S)-AP-3 and (R)-AP-4 in good yield.