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
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.
A two-step synthesis of 2,3-disubstituted thiophenes from trans-2-aryl-3-nitrocyclopropane-1,1-dicarboxylates and 1,4-dithiane-2,5-diol is described. The nitrocyclopropane dicarboxylates when treated with boron trifluoride etherate formed aroylmethylidene malonates in situ through ring-opening followed by rearrangement and a Nef reaction, and subsequent addition of 1,4-dithiane-2,5-diol and triethylamine
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).