Temperature-dependent isomerisation versus net fragmentation of secondary allylic alcohols with Grubbs’ catalyst
摘要:
Secondary allylic alcohols with 10 mol% of Grubbs catalyst in refluxing toluene/1,2-dichloroethane undergo isomerisation to ethyl ketones whereas with 100 mol% of Grubbs catalyst at room temperature, a net fragmentation reaction with the loss of a carbon atom occurs, to provide a methyl ketone. Probable mechanisms are described. (C) 2001 Elsevier Science Ltd. All rights reserved.
SIMPLE AND CHEMOSELECTIVE SYNTHESIS OF KETONES FROM CARBOXYLIC ACIDS AND GRIGNARD REAGENTS USING DICHLOROTRIPHENYLPHOSPHORANE
作者:Tamotsu Fujisawa、Sachio Iida、Hiroshi Uehara、Toshio Sato
DOI:10.1246/cl.1983.1267
日期:1983.8.5
Dichlorotriphenylphosphorane was found to be a good condensation reagent for synthesis of ketones from carboxylic acids and Grignardreagents under mild conditions. Synthetic utility of the present method is demonstrated by the chemoselective reaction of carboxylic acids possessing such a functional group as halogen, cyano, or carbonyl.