Synthesis of multisubstituted furans via copper-catalyzed intramolecular O-vinylation of ketones with vinyl bromides
摘要:
With the catalysis of Cul/3,4,7,8-tetramethyl-1,10-phenanthroline, various ketones smoothly underwent the intramolecular O-vinylation with vinyl bromides leading to the efficient synthesis of the corresponding multisubstituted furans. (C) 2010 Elsevier Ltd. All rights reserved.
A simple method has been developed for synthesis of γ-halo-enones. The approach employs a sequence involving initial indium-mediated allenylation reactions of phenacyl halides with propargyl bromide. This process is followed by acid-promoted rearrangement reactions of the formed homoallenic halohydrins. The new method can be incorporated into routes for the efficient synthesis of various five-membered
A continuous-flow synthesis of annulated and polysubstituted furans from the reaction of ketones and α-haloketones
作者:Mark York
DOI:10.1016/j.tetlet.2011.09.083
日期:2011.11
A synthesis of di-, tri- and tetra-substituted furans from reaction of the corresponding ketones and α-haloketones with LiHMDS is reported. Reaction under continuous-flow conditions gave increased yields and removed the need for external cooling when compared to the unoptimised batch conditions.
Substituted furans as inhibitors of 3-hydroxy-3-methylglutaryl-coa
申请人:American Home Products Corporation
公开号:US04792614A1
公开(公告)日:1988-12-20
Compounds of the formula: ##STR1## in which ##STR2## where M is hydrogen or alkyl; one of R.sup.2 and R.sup.3 is phenyl or substituted phenyl where the substituent is alkyl, alkoxy, halogen, trifluoromethyl, nitro, amino, cyano or carboxyl; and the other of R.sup.2 and R.sup.3 is hydrogen, alkyl, or a halogen; or a pharmaceutically acceptable salt thereof, are HMG--CoA reductase inhibitors useful in the treatment of atherosclerosis, hypercholesterolaemia, hyperlipaemia and similar disease states characterized by elevated cholesterol levels in the blood.
The electrochemicalreduction on Hg cathode of a dropping solution of phenacyl bromides in dry acetone-LiClO4 yields 4-aryl-2-methylfurans and acetophenones. In this process the acetone plays a dual role, as solvent and reagent.