Eco-friendly and facile synthesis of 2-substituted-1H-imidazo[4,5-b]pyridine in aqueous medium by air oxidation
作者:Rajesh P. Kale、Mohammad U. Shaikh、Ganesh R. Jadhav、Charansingh H. Gill
DOI:10.1016/j.tetlet.2008.12.104
日期:2009.4
a new environmentally-benign, convenient, and facile methodology for the synthesis of 2-substituted-1H-imidazo[4,5-b]pyridine. The reaction of 2,3-diaminopyridine with substituted aryl aldehydes in water under thermal conditions without the use of any oxidative reagent has been studied. The reaction has yielded 1H-imidazo[4,5-b]pyridine derivatives by an air oxidative cyclocondensation reaction in
我们报告了一种新的环境友好,方便,简便的方法合成2-取代-1 H-咪唑并[4,5- b ]吡啶。研究了2,3-二氨基吡啶与取代的芳基醛在水中在热条件下不使用任何氧化剂的反应。反应产生1 H-咪唑并[4,5- b吡啶衍生物通过空气氧化环缩合反应一步一步即可获得极佳的收率。此外,合成了一系列化合物,并通过熔点,EI-MS,NMR和IR工具对其进行了表征。为了比较,参考样品通过报道的方法制备。从经济和环境的角度来看,利用水性介质,容易的反应条件,分离和纯化使这种操作非常有趣。