Boron Trifluoride Mediated Ring-Opening Reactions of trans-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates. Synthesis of Aroylmethylidene Malonates as Potential Building Blocks for Heterocycles
摘要:
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.
A series of new 2H-benzo[1,4]thiazine derivatives were synthesized from aroylmethylidene malonates and o-aminothiophenols by condensation/cyclization methodology in order to evaluate their COX-2 inhibitory activity. In-silico studies indicated that among the synthesized compounds, 5i could serve as a potential candidate for the task. So, compound 5i was taken as a model ligand for in vitro studies