synthesized regioselectively in good to high yields by condensation of N,N-disubstituted thioureas and ethyl chloroacetate in the presence of basic ionicliquid [bmim]OH as a catalyst under conventional and ultrasonicirradiation conditions. Underultrasonicirradiation, the reaction furnished the desired 2-iminothiazolidinones in higher yields (76–87%) and lower reaction times (30–55 min). GRAPHICAL ABSTRACT
Synthesis of 2-iminothiazolidin-4-ones <i>via</i> copper-catalyzed [2 + 1 + 2] tandem annulation
作者:Mingming Zhao、Yiming Guo、Qi Wang、Lanqi Liu、Shujie Zhang、Wei Guo、Lin-Ping Wu、Fayang G. Qiu
DOI:10.1039/d2ra07872d
日期:——
In this paper, an efficient synthesis of 2-iminothiazolidin-4-ones through a copper-catalyzed tandem annulation reaction of alkyl amines, isothiocyanates and diazo acetates is presented. Notable advantages of this [2 + 1 + 2] cyclization methodology include readily accessible starting materials, simple operation, mild reaction conditions, high yields, step-economy and diverse functional group tolerance