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,
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。
Ionic liquid-catalyzed synthesis of triazoloquinazolinones, chromeno[4,3-d]benzothiazolopyrimidines and benzoimidazopyrimidine derivatives
1,3-Disulfonic acid imidazolium trifluoroacetate ([Dsim][CF3CO2]) was employed as an efficient, homogeneous and recyclable ionic liquid catalyst for the synthesis of triazoloquinazolinones, chromeno[4,3-d]benzothiazolopyrimidines and benzoimidazopyrimidine derivatives via one-pot multi-component reactions under thermal and solvent-free conditions. The catalyst is demonstrated excellent catalytic properties
1,3-二磺酸咪唑三氟乙酸盐([Dsim] [CF 3 CO 2 ])被用作一种高效,均相且可回收的离子液体催化剂,用于通过合成三唑并喹唑啉酮,苯并[4,3- d ]苯并噻唑并嘧啶和苯并咪唑并嘧啶衍生物在无热和无溶剂条件下进行一锅多组分反应。在短的反应时间和低成本下,该催化剂表现出优异的催化性能和良好的收率。所有产品均通过重结晶获得,无需繁琐的后处理。
One-Pot Synthesis of Pyrimido[1,2-<i>a</i>]benzimidazoles under Solvent-Free Conditions
A series of pyrimido[1,2‐a]benzimidazoles were obtained from aldehydes, 2‐aminobenzimidazole and ethyl acetoacetate in good‐to‐excellent yields by a simple, mild, and efficient procedure utilizing N,N,N′,N′‐tetrabromobenzene‐1,3‐disulfonamide (TBBDA) and poly(N‐bromo‐N‐ethylbenzene‐1,3‐disulfonamide) (PBBS) as catalysts.
通过使用N,N,N',N'-的简单,温和且有效的方法,从醛,2-氨基苯并咪唑和乙酰乙酸乙酯中获得了一系列嘧啶[1,2- a ]苯并咪唑,收率良好至优异。四溴苯-1,3-二磺酰胺(TBBDA)和聚(N-溴-N-乙基苯-1,3-二磺酰胺)(PBBS)作为催化剂。