Silica sulfuric acid/ethylene glycol as an efficient catalyst for the synthesis of benzo[4,5]imidazo[1,2-<i>a</i>]pyrimidine-3-carbonitrile derivatives
作者:Wahid M. Basyouni、Samir Y. Abbas、Nagwa M. Abdelazeem、Khairy A. M. El-Bayouki、Mohamed Y. El-Kady
DOI:10.1080/00397911.2019.1652322
日期:2019.11.17
developed for the synthesis of new benzo[4,5]imidazo[1,2-a]pyrimidine-3-carbonitrile derivatives in excellent yields. The synthesis was achieved through the reaction of 2-aminobenzimidazole, aldehydes and active nitriles (malononitrle or ethyl cyanoacetae) in the presence of silica sulfuric acid/ethylene glycol. This protocol offers very short reaction times (in some cases, reaction times were reduced to five