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。
Three-component synthesis of 4-aryl-1<i>H</i>-pyrimido[1,2-<i>a</i>]benzimidazole derivatives in ionic liquid
作者:Changsheng Yao、Song Lei、Cuihua Wang、Tuanjie Li、Chenxia Yu、Xiangshan Wang、Shujiang Tu
DOI:10.1002/jhet.215
日期:——
A green and simple synthesis of 4-ayrl-3,4-dihydro-1H-pyrimido[1,2-a]benzimidazolederivatives was accomplished in excellent yields via the reaction of aryl aldehyde, 1,3-dicarbonyl compounds and 1H-benzo[d]imidazol-2-amine in ionicliquid of [bmim+][BF 4−]. This protocol has the advantages of easier work-up, mild reaction conditions, high yields, and an environmentally benign procedure compared with
通过芳基醛,1,3-二羰基化合物和1 H的反应,以优异的收率完成了绿色简单的4-ayrl-3,4-dihydro-1 H-嘧啶[1,2- a ]苯并咪唑衍生物的合成。[bmim + ] [BF ]的离子液体中的-苯并[ d ]咪唑-2-胺。与已报道的方法相比,该方案具有易于后处理,反应条件温和,收率高和对环境无害的优点。J.杂环化学。(2010)。 4-
Nano-Fe<sub>3</sub>O<sub>4</sub>@silica sulfuric acid as a reusable and magnetically separable potent solid acid catalyst in Biginelli-type reaction for the one-pot multicomponent synthesis of fused dihydropyrimidine derivatives: A greener NOSE and SFRC approach
作者:Binoyargha Dam、Amarta Kumar Pal、Ajay Gupta
DOI:10.1080/00397911.2015.1135955
日期:2016.2
ABSTRACT An efficient, highly product selective, eco-friendly, one-pot multicomponent synthesis of dihydropyrimidine derivatives via Biginelli reaction has been described. The reaction was developed by greener nanoparticle-catalyzed organic synthesis enhancement (NOSE) chemistry and solventfree reaction condition (SFRC) approaches, which helped us in making the procedure greener. The reaction went
Microwave‐assisted synthesis of benzo[4,5]imidazo[1,2‐<i>a</i>]pyrimidines and pyrano[4,3‐<i>b</i>]pyrans catalyzed by L‐glutamine functionalized magnetic nanoparticles in water:ethanol mixture
作者:Aiborlang Thongni、Rishanlang Nongkhlaw、Chayan Pandya、Akella Sivaramakrishna、Paige M. Gannon、Werner Kaminsky
DOI:10.1002/jhet.4785
日期:2024.4
one-pot syntheses of benzo[4,5]imidazo[1,2-a]pyrimidine and pyrano[4,3-b]pyran derivatives using L-glutamine functionalized nanoparticles (Fe3O4@SiO2@L-glutamine NPs) undermicrowave irradiation. The organo-nanocatalyst underwent characterization through diverse techniques, including FT-IR, p-XRD, SEM, TEM, EDX, XPS, TGA, and VSM. Microwave irradiation and multicomponent reactions synergistically yield