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. 2019 Dec;34(1):1457-1464.
doi: 10.1080/14756366.2019.1652282.

Synthesis and biological evaluation of novel 3-(quinolin-4-ylamino)benzenesulfonamidesAQ3 as carbonic anhydrase isoforms I and II inhibitors

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Synthesis and biological evaluation of novel 3-(quinolin-4-ylamino)benzenesulfonamidesAQ3 as carbonic anhydrase isoforms I and II inhibitors

Mohammad M Al-Sanea et al. J Enzyme Inhib Med Chem. 2019 Dec.

Abstract

Carbonic anhydrases (CAs, EC 4.2.1.1) are crucial metalloenzymes that are involved in diverse bioprocesses. We report the synthesis and biological evaluation of novel series of benzenesulfonamides incorporating un/substituted ethyl quinoline-3-carboxylate moieties. The newly synthesised compounds were in vitro evaluated as inhibitors of the cytosolic human (h) isoforms hCA I and II. Both isoforms hCA I and II were inhibited by the quinolines reported here in variable degrees: hCA I was inhibited with KIs in the range of 0.966-9.091 μM, whereas hCA II in the range of 0.083-3.594 μM. The primary 7-chloro-6-flouro substituted sulphfonamide derivative 6e (KI = 0.083 μM) proved to be the most active quinoline in inhibiting hCA II, whereas, its secondary sulfonamide analog failed to inhibit the hCA II up to 10 μM, confirming the crucial role of the primary sulphfonamide group, as a zinc-binding group for CA inhibitory activity.

Keywords: carbonic anhydrase; cytosolic isoforms hCA I and II; quinolines; synthesis.

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Figures

Figure 1.
Figure 1.
Structures of some approved CAIs antiglaucoma drugs, and the target quinolines 6a–f and 11.
Scheme 1.
Scheme 1.
Synthesis of target quinolines 6a–f; Reagents and conditions: (i) DEEMM/Ethanol/reflux 1 h; (ii) Diphenyl ether/250 °C/45 min; (iii) POCl3/reflux 1 h; (iv) Absolute ethyl alcohol/reflux 4 h.
Scheme 2.
Scheme 2.
Synthesis of target quinoline 11; Reagents and conditions: (i) Hunig's Base/THF/stirring at r.t./1 h; (ii) H2/10% Pd/C/MeOH/r.t.; (iii) Compound 4e/Absolute ethyl alcohol/reflux 4 h.

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Grants and funding

This research was supported by Jouf University (Grant 39/480), the KIST Institutional programs (Grant No. 2E29260) from Korea Institute of Science and Technology, and by the Creative Fusion Research Program through the Creative Allied Project funded by the National Research Council of Science & Technology (CAP-12–1-KIST).

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