SnCl<sub>4</sub>-mediated one-pot synthesis of 2,4,5-trisubstituted thiazoles from nitro-substituted donor–acceptor cyclopropanes and thioamides
作者:Maniarasu Meenakshi、Kannupal Srinivasan
DOI:10.1039/d2ob01604d
日期:——
The treatment of nitro-substituted donor–acceptor cyclopropanes (DACs) with SnCl4 and the subsequent reaction with thioamides provide one-pot access to various thiazole derivatives. Aroylmethylidene malonates were produced as intermediates in the reactions and they underwent conjugate addition followed by cyclocondensation with thioamides to afford the products. This work demonstrates the versatility
A sequential one-pot procedure has been developed to access β-amino-γ-keto-malonates from nitro-substituted donor–acceptor cyclopropanes and four different nitrogen heterocycles. The reaction proceeds through in situ generation of aroylmethylidene malonates from 1-aryl-2-nitrocyclopropanes via Kornblum-type ring-opening oxidation using DMSO and subsequent aza-Michael addition with the nitrogen heterocycles
Boron Trifluoride Mediated Ring-Opening Reactions of <i>trans</i>-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates. Synthesis of Aroylmethylidene Malonates as Potential Building Blocks for Heterocycles
作者:Thangavel Selvi、Kannupal Srinivasan
DOI:10.1021/jo402848v
日期:2014.4.18
trans-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates, upon treatment with BF3 center dot OEt2, undergo ring-opening rearrangement and the Nef reaction to give aroylmethylidene malonates. The products are found to be potential precursors for heterocycles, such as imidazoles, quinoxalines, and benzo[1,4]thiazines.