The enolates, generated from phenacyl bromides by sodium telluride, yield 2,4-diarylfurans in addition to the expected dehalogenation products. No 1,4-dicarbonyl compounds could be isolated even in the presence of excess oxidizing agent, copper(II) chloride. Condensation of 2-(methoxymethoxy)arenecarbaldehydes with ethyl bromoacetate in the presence of sodium telluride gave the expected α,β-unsaturated
Sulphated Zirconia as an Eco-Friendly Catalyst in Acylal Preparation under Solvent-Free Conditions, Acylal Deprotection Assisted by Microwaves, and the Synthesis of Anhydro-Dimers of o-Hydroxybenzaldehydes
A solvent-free approach is described for the regioselective synthesis of acylals (1,1-diacetates) in shorter reaction times and higher yields, compared to conventional methodology using solvents. In the protection reaction of the o-hydroxybenzaldehyde the formation of acetyl compounds and anhydro-dimers was observed. The deprotection reaction involves microwave (MW) exposure of diluted reactants in
Synthesis of substituted salicylaldehyde derivatives
申请人:Saudi Aramco Technologies Company
公开号:US10040800B2
公开(公告)日:2018-08-07
Among other things, the present invention encompasses methods of synthesizing salicylaldehyde derivatives comprising the steps of: a) providing salicylaldehyde or a derivative thereof, b) forming an anhydro dimer of the provided salicylaldehyde compound, c) performing one or more chemical transformations on the anhydro dimer and d) hydrolyzing the anhydro dimer to provide a salicylaldehyde derivative different from that provided in step (a).