Heterogenized tungsten complex: an efficient and high yielding catalyst for the synthesis of structurally diverse tetra substituted pyrrole derivatives via four-component assembly
作者:Amol B. Atar、Yeon Tae Jeong
DOI:10.1016/j.tetlet.2013.08.016
日期:2013.10
An efficient, high yielding, and expeditious method has been developed for the synthesis of diversity oriented pyrrole derivatives via a four component, one-pot cyclocondensation reaction of amines, aldehydes, alpha-methylene ketones, and nitroalkanes using silica supported tungstic acid as a heterogeneous catalyst for the first time. The scope of the domino reaction is successfully explored toward synthesis of highly aryl-substituted pyrroles. The reaction was conveniently promoted by silica supported tungstic acid and the catalyst could be recovered easily after the reaction and reused without any loss of its catalytic activity. The advantageous features of this methodology are high atom-economy, operational simplicity, shorter reaction time, convergence, and facile automation. (C) 2013 Elsevier Ltd. All rights reserved.
p-Toluenesulfonic acid doped polystyrene (PS-PTSA): solvent-free microwave assisted cross-coupling-cyclization–oxidation to build one-pot diversely functionalized pyrrole from aldehyde, amine, active methylene, and nitroalkane
作者:Vijay Vilas Shinde、Sang Dong Lee、Yong Seok Jeong、Yeon Tae Jeong
DOI:10.1016/j.tetlet.2014.12.126
日期:2015.2
A solvent-free environmentally benign approach for the synthesis of diversified pyrrole derivatives has been described by the one-pot multicomponent reaction of aldehydes, nitroalkane, amine, and enolizable active C–H reactant using polystyrene supported p-toluenesulfonicacid (PS-PTSA) under microwave irradiation. In comparison to the conventional methods, this efficient green protocol provides remarkable