An Efficient Green Multi-Component Reaction Strategy for the Synthesis of Highly Functionalised Pyridines and Evaluation of Their Antibacterial Activities
作者:Lakkireddy Srinivasula Reddy、Tirumalareddy Ram Reddy、Reddy Bodireddy Mohan、Avula Mahesh、Yeramanchi Lingappa、Nallagondu Chinna Gangi Reddy
DOI:10.1248/cpb.c13-00412
日期:——
An efficient green multi-component reaction (MCR) method has been developed for the synthesis of 2-amino-4-aryl/heteroaryl-6-(pyridin-2-ylthio)pyridine-3,5-dicarbonitrile(s) via a 3-component reaction of aryl aldehyde(s), malononitrile and 2-mercaptopyridine in the presence of K2CO3 under solvent free reaction conditions (SFRC) using grinding technique at room temperature in a single step. The advantages of the present protocol is operationally simple, environmentally benign, solvent-free reaction conditions (SFRC), simple work up, excellent isolated yields of desired products and viable method for large scale applications in pharmaceutical industry. Interestingly, the synthesized compounds showed moderate to excellent antibacterial activities against Gram-positive and Gram-negative bacterial strains.
在无溶剂反应条件(SFRC)下,采用研磨技术,在室温下通过芳基醛、丙二腈和 2-巯基吡啶的 3 组分反应,一步合成 2-氨基-4-芳基/异芳基-6-(吡啶-2-基硫基)吡啶-3,5-二甲腈。本方案的优点是操作简单、对环境无害、无溶剂反应条件(SFRC)、操作简单、所需产物的分离产率极高,而且是制药业大规模应用的可行方法。有趣的是,合成的化合物对革兰氏阳性和革兰氏阴性细菌菌株显示出中等到卓越的抗菌活性。