An efficient and practical synthesis of benzazolo[2,1-b]quinazolinones and triazolo[2,1-b]quinazolinones catalyzed by nano-sized NS-C4(DABCO-SO3H)2)·4Cl
作者:Omid Goli-Jolodar、Farhad Shirini
DOI:10.1007/s13738-017-1164-3
日期:2017.11
In this study, 4,4′-(butane-1,4-diyl)bis(1-sulfo-1,4-diazabicyclo[2.2.2]octane-1,4-diium)tetrachloride (NS-C4(DABCO-SO3H)2)·4Cl is used as a nano-sized Brönsted acid catalyst for the efficient and preferment synthesis of benzazolo[2,1-b]quinazolinones and triazolo[2,1-b]quinazolinones derivatives. This protocol has many advantages including mild reaction conditions, acceptable reaction times, high
在这项研究中,4,4'-(butane-1,4-diyl)bis(1-sulfo-1,4-diazabicyclo [2.2.2] octane-1,4-diium)tetrachloride(NS-C 4(DABCO -SO 3 H)2)·4Cl用作纳米级布朗斯台德酸催化剂,可高效,优选地合成苯并[2,1- b ]喹唑啉酮和三唑并[2,1- b ]喹唑啉酮衍生物。该方案具有许多优点,包括温和的反应条件,可接受的反应时间,高收率和产物的后处理容易以及催化剂的可重复使用性。
Poly(vinylpyrrolidonium) perchlorate catalyzed one-pot synthesis of tricyclic dihydropyrimidine derivatives
A simple and efficient procedure for the synthesis of benzo[4,5]imidazo[1,2-α]pyrimidine and 2-amino-4-substituted-1,4-dihydrobenzo[4,5]imidazolo[1,2-α]pyrimidine-3-carbonitrile derivatives using poly(vinylpyrrolidonium) perchlorate [PVPH]ClO4} as a newly reported, modified polymeric catalyst is reported. Some of the advantages of this novel synthetic method are: easy preparation of the catalyst,
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。
Synthesis of benzo[4,5]imidazo[1,2-<i>a</i>]pyrimidines and 2,3-dihydroquinazolin-4(1<i>H</i>)-ones under metal-free and solvent-free conditions for minimizing waste generation
efficient and recyclable catalyst for the synthesis of benzo[4,5]imidazo[1,2-a]pyrimidines and 2,3-dihydroquinazolin-4(1H)-ones. The reactions proceeded smoothly with a broad scope of substrates providing the expected products in good to excellent yields under an atom-economical pathway. The low-cost recyclable catalyst, metal- and solvent-freeconditions, and the ease of product isolation are the
发现 Brønsted 酸性离子液体是合成苯并[4,5]咪唑并[1,2 - a ]嘧啶和 2,3-二氢喹唑啉-4(1 H )-酮的有效且可回收的催化剂。该反应在广泛的底物范围内顺利进行,在原子经济途径下以良好至优异的产率提供了预期的产物。低成本的可回收催化剂、无金属和无溶剂条件以及易于产品分离是解决合成药物中痕量金属污染问题的突出优势。
Nano-Co-[4-chlorophenyl-salicylaldimine-pyranopyrimidine dione]Cl2 as a new Schiff base complex and catalyst for the one-pot synthesis of some 4H-pyrimido[2,1-b]benzazoles
was prepared and fully characterized as a new nano-Schiff base complex. Nano-[Co-4CSP]Cl2 was successfully used as an efficient catalyst for the synthesis of some4H-pyrimido[2,1-b]benzazoles such as 4H-pyrimido[2,1-b]benzothiazoles and 4H-pyrimido[2,1-b]benzimidazoles.