[EN] C-ARYL GLYCOSIDE COMPOUNDS FOR THE TREATMENT OF DIABETES AND OBESITY [FR] COMPOSÉS C-ARYL GLYCOSIDES POUR LE TRAITEMENT DU DIABÈTE ET DE L'OBÉSITÉ
A convenient strategy for replacement of the anomeric hydroxyl group by difluoromethyl functionality in carbohydrate derivatives
作者:J.Sarah Houlton、William B. Motherwell、Barry C. Ross、Matthew J. Tozer、David J. Williams、Alexandra M.Z. Slawin
DOI:10.1016/s0040-4020(01)88029-7
日期:1993.9
A series of carbohydrate gem-difluoroenol ethers are readily prepared by the reaction of the corresponding lactones with dibromodifluoromethane, tris(dimethylamino)phosphine and zinc. Subsequent catalytic hydrogenation provides difluoromethyl C-glycoside analogues in which the exocyclic oxygen atom has been replaced by a difluoromethylene unit.
Free radical chain reactions for the preparation of novel anomeric carbohydrate difluoromethylene -phosphonates and -phosphonothioates
作者:Timothée F. Herpin、William B. Motherwell、Brian P. Roberts、Sylvain Roland、Jean-Marc Weibel
DOI:10.1016/s0040-4020(97)10007-2
日期:1997.11
The generation of phosphonyl or thiophosphonyl radicals in the presence of carbohydrate gem-difluoenol ethers provides new routes to anomeric difluoromethylenephosphonates and difluoromethylenephosphonothioates, respectively.
Preparation of some new anomeric carbohydrate difluoromethylenephosphonates via phosphonyl radical addition to gem-difluoroenol ethers
作者:Timoth�e F. Herpin、J. Sarah Houlton、William B. Motherwell、Brian P. Roberts、Jean-Marc Weibel
DOI:10.1039/cc9960000613
日期:——
Generation of a phosphonyl radical either from diethyl phosphite, or diethyl (phenylselenyl)phosphonate in conjunction with tributylstannane, in the presence of a carbohydrate gem-difluoroenol ether provides a new route to anomeric difluoromethylenephosphonates; in the course of these reactions, some unusual stereochemical effects are observed.
The instant invention provides novel cholesterol absorption inhibitors of Formula I and the pharmaceutically acceptable salts and esters thereof. The compounds are useful for lowering plasma cholesterol levels, particularly LDL cholesterol, and for treating and preventing atherosclerosis and atherosclerotic disease events.
Exo gem-difluoromethylene-artemisinins (8) has been designed to mimic artemisinin. The classical Wittig olefination reaction applied to artemisinin failed. An alternative reaction involving the generation of an alpha-CF3 carbanion, from the corresponding bromide 6, allowed the access to the target compound 8, and could also be exemplified in sugar series. The replacement of the carbonyl function by a difluoroethylene moiety resulted in a better antimalarial activity. (C) 2006 Elsevier B.V. All rights reserved.