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
Synthesis of 2,4,5-trisubstituted oxazoles through tin(<scp>iv</scp>) chloride-mediated reaction of trans-2-aryl-3-nitro-cyclopropane-1,1-dicarboxylates with nitriles
作者:Thangavel Selvi、Kannupal Srinivasan
DOI:10.1039/c4cc04764h
日期:——
trans-2-Aryl-3-nitro-cyclopropane-1,1-dicarboxylates when reacted with nitriles in the presence of tin(IV) chloride afford 2,4,5-trisubstituted oxazoles in good to excellent yields. The reactions take place through in situ generation of aroylmethylidene malonates from the cyclopropanes, followed by conjugate addition of nitriles to the malonates to form nitrilium ion intermediates and subsequent cyclisation
An efficient asymmetric organocatalytic conjugate addition reaction of pyrazolin-5-ones with arylomethylidene malonates has been successfully developed by employing bifunctional Cinchona derived thiourea organocatalysts. The protocol provides straightforward access to pyrazole substituted scaffolds in good yields with high stereocontrol.
Highly enantioselective Friedel–Crafts C2-alkylation reactions of 3-substituted indoles with α,β-unsaturated esters and nitroalkenes were developed using chiral Lewis acids as catalysts, which afforded chiral indole derivatives bearing C2-benzylic stereogenic centers in good to excellent yields (up to 99%) and enantioselectivities (up to 96% ee).
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