New applications of phosphoric acid supported on alumina (H3PO4–Al2O3) as a reusable heterogeneous catalyst for preparation of 2,3-dihydroquinazoline-4(1H)-ones, 2H-indazolo[2,1-b]phthalazinetriones, and benzo[4,5]imidazo[1,2-a]pyrimidines
作者:Hamid Reza Shaterian、Nafiseh Fahimi、Kobra Azizi
DOI:10.1007/s11164-013-1087-2
日期:2014.5
An eco-friendly procedure for synthesis of 2,3-dihydroquinazoline-4(1H)-one, 2H-indazolo[2,1-b]phthalazinetrione, and benzo[4,5]imidazo[1,2-a]pyrimidine derivatives by three-component reaction, with phosphoric acid supported on alumina as catalyst, is described. Noticeable features of the method are that it is solvent-free, work-up is easy, yields are excellent, and the catalyst is reusable.
合成2,3-二氢喹唑啉-4(1 H)-one,2 H-吲唑并[ 2,1 - b ]邻苯二氮杂三酮和苯并[4,5]咪唑并[1,2- a ]的环保方法描述了三组分反应的嘧啶衍生物,其中磷酸负载在氧化铝上作为催化剂。该方法的显着特征是无溶剂,后处理容易,产率极好并且催化剂可重复使用。