Novel benzenesulfonamide‐bearing pyrazoles and 1, 2, 4‐thiadiazoles as selective carbonic anhydrase inhibitors. Issue 1 (1st October 2021)

• Record Type: Journal Article
• Authors: Kumar, Rajiv; Kumar, Amit; Ram, Sita; Angeli, Andrea; Bonardi, Alessandro; Nocentini, Alessio; Gratteri, Paola; Supuran, Claudiu T.; Sharma, Pawan K.
• Is Part Of: Archiv der Pharmazie. Volume 355:Issue 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-01
• Subjects: 1, 2, 4‐thiadiazole -- acetazolamide -- carbonic anhydrase isoforms -- pyrazole -- sulfonamide; Pharmaceutical chemistry -- Periodicals; Pharmacology -- Periodicals; 615.19
• DOI: 10.1002/ardp.202100241
• Languages: English
• ISSNs: 0365-6233

Abstract

Abstract: Two series comprising 20 novel benzenesulfonamides bearing thioureido‐linked pyrazole 8 and amino‐1, 2, 4‐thiadiazole 10 were synthesized and assayed as human carbonic anhydrase (hCA) inhibitors against isoforms I and II as well as the tumor‐associated isoforms IX and XII. Molecular modeling studies of some potent derivatives (8a, 8c, 10a, and 10c ) were also performed against isoforms hCA I, II, and XII. Both the promising series of compounds were synthesized by using commercially available mtethyl ketones and sulfanilamide as the starting materials. Interestingly, this paper also reports a novel methodology for the synthesis of amino‐1, 2, 4‐thiadiazoles 10 using 3‐amino isoxazoles and 4‐isothiocyanatobenzenesulfonamide as reactants. The activity profile of all the newly synthesized compounds reveals that amino‐linked 1, 2, 4‐thiadiazoles 10 were better inhibitors of the cytosolic isoform, hCA I, as compared to thioureido‐linked pyrazoles 8 . Further, hCA II was strongly inhibited by nearly all the newly synthesized sulfonamides, while all the compounds were less effective as hCA IX and XII inhibitors compared to the standard drug acetazolamide. However, in terms of selectivity, compound 8e was found to be the most selective inhibitor of hCA II, which is the isoform associated with glaucoma, edema, altitude sickness, and epilepsy. Abstract : Novel thioureido‐linked pyrazoles, as well as amino‐1, 2, 4‐thiadiazoles bearing the benzenesulfonamide moiety, were synthesized, characterized, and biologically evaluated as human carbonic anhydrase (hCA) inhibitors against isoforms hCA I, II, IX, and XII. In general, all the amino‐1, 2, 4‐thiadiazoles were found to be better inhibitors of isoforms hCA I and II as compared to the thioureido‐linked pyrazoles as well as the standard drug acetazolamide.