Resolution of pentafluorophenyl 2-phenylpropanoate using combinations of quasi-enantiomeric oxazolidin-2-ones
作者:Najla Al Shaye、David M. Benoit、Sameer Chavda、Elliot Coulbeck、Marco Dingjan、Jason Eames、Yonas Yohannes
DOI:10.1016/j.tetasy.2011.02.022
日期:2011.2
The kinetic, mutual and parallel resolution of a series of structurally related active esters derived from 2-phenylpropanoic acid using a combination of quasi-enantiomeric oxazolidin-2-ones is discussed. (C) 2011 Elsevier Ltd. All rights reserved.
Resolution of Pentafluorophenyl Active Esters Using (S)-4-Phenyloxazolidin-2-thione
作者:Jason Eames、Najla Al Shaye、Tom Broughton、Elliot Coulbeck
DOI:10.1055/s-0028-1088218
日期:2009.4
A series of structurally related racemic pentafluorophenyl active esters were resolved using an equimolar amount of (S)-4-phenyloxazolidin-2-thione. The levels of diastereocontrol were found to be excellent (>86% de at Ë30% conversion).
The parallelkineticresolution of racemic pentafluorophenyl 2-phenylpropionate using an equimolar combination of quasi-enantiomeric oxazolidin-2-ones is discussed. The levels of diastereoselectivity were excellent (>90% de) leading to separable quasi-enantiomeric oxazolidin-2-one adducts in good yield. This methodology was subsequently used to resolve a series of 2-aryl propionic and butanoic acids