Microwave-assisted efficient synthesis of benzo[4,5]imidazo[1,2-a]-pyrimidine derivatives in water under catalyst-free conditions
作者:Shujiang Tu、Qingqing Shao、Dianxiang Zhou、Longji Cao、Feng Shi、Chunmei Li
DOI:10.1002/jhet.5570440625
日期:2007.11
2-a]pyrimidine derivatives were synthesized via the three-component reaction of aldehyde, β-dicarbonylcompound and 2-aminobenzimidazole in water under microwave irradiation and without catalyst conditions. The new protocol has the advantages of higher yield, lower cost, reduced environment impact, wider scope and convenient procedure.
苯并[4,5]咪唑并[1,2- a ]嘧啶衍生物是通过醛,β-二羰基化合物和2-氨基苯并咪唑在微波辐射下且无催化剂条件下在水中进行三组分反应而合成的。新协议具有产量高,成本低,对环境影响小,适用范围广,操作方便等优点。
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
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。
Shang, Xiaojun; Geng, Mingjiang; Wu, Liqiang, Asian Journal of Chemistry, 2012, vol. 24, # 2, p. 515 - 517
作者:Shang, Xiaojun、Geng, Mingjiang、Wu, Liqiang
DOI:——
日期:——
Wu, Liqiang; Yan, Fulin; Yang, Chunguang, Bulletin of the Chemical Society of Ethiopia, 2010, vol. 24, # 3, p. 417 - 423