Asymmetric carbonyl-ene and Friedel–Crafts reactions catalysed by Lewis acid platinum group metal complexes of the enantiopure atropisomeric biaryl-like diphosphine (S)-Me2-CATPHOS: a comparison with BINAP
作者:Simon Doherty、Julian G. Knight、Hamid Mehdi-Zodeh
DOI:10.1016/j.tetasy.2012.01.022
日期:2012.2
Lewis acid platinum and palladium complexes of (S)-Me-2-CATPHOS catalyse the carbonyl-ene reaction between allylbenzene derivatives and ethyl trifluoropyruvate to give the expected alpha-hydroxy esters with ee's up to 97%, while the corresponding reaction involving 2-allylfuran and thiophene was exclusively selective for Friedel-Crafts-type reactivity and gave the corresponding 2-hydroxy-trifluoromethyl ethyl esters in good yield and moderate to good enantioselectivity. (C) 2012 Elsevier Ltd. All rights reserved.