Synthesis of chiral (phosphinoaryl)oxazolines, a versatile class of ligands for asymmetric catalysis
作者:Guido Koch、Guy C. Lloyd-Jones、Olivier Loiseleur、Andreas Pfaltz、Roger Prétôt、Silvia Schaffner、Patrick Schnider、Peter von Matt
DOI:10.1002/recl.19951140413
日期:——
Enantiomerically pure 2-[2-(diphenylphosphino)aryl]oxazolines are readily prepared from 2-bromobenzonitrile by transmetalation with BuLi, subsequent reaction with chloro-diphenylphosphine and conversion of the resulting phosphinoaryl nitrile to the oxazoline by treatment with a chiral amino alcohol in the presence of ZnCl2. An alternative synthesis is based on the orthometalation of 2-aryloxazolines