A recyclable, convenient, and efficientcatalytic system for C-acylation of 1,3-dicarbonyl compounds and malononitrile with acid chlorides has been developed, giving moderate to excellent yields under mild conditions. This is the firstcatalytic example of such reactions. In addition, by applying this protocol as the key step, 3,5-disubstituted-1H-pyrazole-4-carboxylate can easily be synthesized in
SYNTHESIS OF SUBSTITUTED AROMATIC COMPOUNDS USING BTC/DMF AS VILSMEIER REAGENT
作者:W. K. Su、Z. C. Lu、X. X. Zhang
DOI:10.1080/00304940809458111
日期:2008.10
utilization of Vilsmeier salts derived from bis-(trichloromethyl) carbonate (triphosgene, BTC) and N 8-dimethylformamide (DMF) has been explored extensively? In previous papers, we reported organic reactions involving by BTCDMF as the Vilsmeier reagent? In continuation of our studies on a variety of applications of BTC, we herein report a convenient method for the preparation of some substituted aromatic compounds