A Tandem Aza-Claisen Rearrangement and Ring Closing Metathesis Reaction for the Synthesis of Cyclic Allylic Trichloroacetamides
作者:Michael D. Swift、Andrew Sutherland
DOI:10.1021/ol702299c
日期:2007.12.1
A one-pot tandem palladium(II)-catalyzed aza-Claisenrearrangement and ring closing metathesis process has been developed for the efficient synthesis of cyclic allylic trichloroacetamides. The use of chiral Pd(II) catalysts such as (S)-COP-Cl during the rearrangement stage results in the preparation of these compounds in excellent yields and in high enantiomeric excess.
A range of cyclic allylic trichloroacetamides has been synthesised. Dihydroxylation utilising catalytic osmium tetroxide and quinuclidine-N-oxide monohydrate as the re-oxidant in dichloromethane yields diols with good levels of syn selectivity. (C) 2000 Elsevier Science Ltd. All rights reserved.