Keywords
[3 + 2] dipolar cycloaddition
1
2
3-thiadiazoles.
Chan–Evans–Lam arylation
Lawesson’ reagent
methyl propiolate
pyrazoles
α-acetyl-α-diazomethane sulfonamide
Abstract
An N,N-bis(p-methoxybenzyl)-protected α-acetyl-α-diazo-methane sulfonamide proved to be a useful building block for accessing new 5-methyl-1,2,3-thiadiazole-4-sulfonamide as well as methyl 3-sulfamoyl-1H-pyrazole-5-carboxylate. The latter was further subjected to N-alkylation and N-arylation reactions. All resulting compounds showed potent inhibition of I, II and particularly of cancer-related IX and XII isoforms of human carbonic anhydrase.
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