Simple phosphinite–oxazoline ligands for asymmetric catalysis
作者:Geraint Jones、Christopher J Richards
DOI:10.1016/s0040-4039(01)01041-3
日期:2001.8
4-(Hydroxymethyl)oxazolines, derived from (S)-serine methyl ester and a variety of acid chlorides (RCOCl), were reacted with Ph2PCl to give new phosphinite-oxazoline P-N ligands. These mediate the palladium catalysed asymmetric alkylation with dimethyl malonate with the following racemic propenyl substrates (RCH)-C-1=CHCH(OX)R-1: (a) R-1 =Ph, X = Ac-96% e.e.(S) with R=Ph; (b) R-1 = Me, X = CO2' Bu-70% e.e.(S) with R=(eta (5)-C5H4)(eta (4)-C4Ph4)CO. (C) 2001 Published by Elsevier Science Ltd.