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
Synthesis of a C1-symmetric Box macrocycle and studies towards active-template synthesis of mechanically planar chiral rotaxanes
作者:Pauline E. Glen、James A.T. O'Neill、Ai-Lan Lee
DOI:10.1016/j.tet.2012.10.069
日期:2013.1
A C-1-symmetric Box macrocycle has been synthesized for the first time. The Box macrocycle along with other C-1 and C-2-symmetric Box ligands were evaluated and compared as ligands in the Cadiot-Chodkiewicz, oxidative Heck and CuAAC 'click' reactions as part of our studies towards achieving active-metal template synthesis of mechanically planar chiral rotaxanes. This study constitutes the first report of Cadiot-Chodkiewicz and CuAAC 'click' reactions using Box ligands, as well as the first dedicated study of oxidative Heck reactions using Box ligands. (C) 2012 Elsevier Ltd. All rights reserved.