An asymmetric, SmI2-mediated approach to γ-butyrolactones using a new, fluorous-tagged auxiliary
摘要:
A new, fluorous-tagged chiral auxiliary has been developed for the asymmetric, SmI2-mediated coupling of aldehydes and alpha,beta-unsaturated esters. gamma-Butyrolactones are obtained in moderate to good isolated yield and in high enantiomeric excess. The fluorous tag allows the auxiliary to be conveniently recovered by fluorous solid-phase extraction (FSPE) and reused. (C) 2008 Elsevier Ltd. All rights reserved.