Synthesis of 3,4-dihydropyridin-2-one derivatives in convergent mode applying bio catalyst vitamin B1 and polymer supported catalyst PEG–SO3H from two different sets of building blocks
作者:Koyel Pradhan、Pranabes Bhattacharyya、Sanjay Paul、Asish R. Das
DOI:10.1016/j.tetlet.2012.08.030
日期:2012.10
Two highlyefficient, greenprotocols have been developed for the synthesis of 3,4-dihydropyridin-2-one derivatives from different starting materials exploring two reaction specific catalysts, vitamin B1 (VB1), and PEG–SO3H. VB1 catalyzed simple and convenient protocol has been developed for the synthesis of 3,4-dihydropyridin-2-one derivatives by the installation of aldehyde, cyanoacetamide, and 1
两个高效,绿色协议已经开发了用于3,4-二氢吡啶-2-酮从不同的原料衍生物的探索两个反应特定的催化剂,维生素B合成1(VB 1)和PEG-SO 3 H. VB 1通过安装醛,氰基乙酰胺和1,3-二羰基化合物,已开发出催化简单方便的方案,用于合成3,4-二氢吡啶-2-酮衍生物。此外,通过形成4 H-吡喃核和PEG-SO 3 H催化的一锅法,将醛,丙二腈和1,3-二羰基化合物简单地结合起来,也合成了3,4-二氢吡啶-2-酮衍生物。重排。
Nano crystalline ZnO catalyzed one pot multicomponent reaction for an easy access of fully decorated 4H-pyran scaffolds and its rearrangement to 2-pyridone nucleus in aqueous media
作者:Pranabes Bhattacharyya、Koyel Pradhan、Sanjay Paul、Asish R. Das
DOI:10.1016/j.tetlet.2012.06.086
日期:2012.8
A green and highly efficient protocol has been developed for the synthesis of 4H-pyran scaffolds installing a one-pot three-component coupling reaction of an aldehyde, malononitrile, and a 1,3-diketo compound using nano structured ZnO as the catalyst in aqueous alcoholic medium. A greener method to synthesize 3,4-dihydropyridin-2-one has also been developed by rearranging 4H-pyran derivatives in aqueous medium applying p-TSOH as the right catalyst source. A wide spectrum of functional groups was tolerated in both the developed synthetic protocols with good to excellent yield of the targeted molecules. (c) 2012 Elsevier Ltd. All rights reserved.