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The evaluation of isatin analogues as inhibitors of monoamine oxidase
Prinsloo, Izak F. ; Petzer, Jacobus P. ; Cloete, Theunis T. , et al. Chem. Biol. Drug Des.,2023,102(5):1067-1074. DOI: 10.1111/cbdd.14304 PubMed ID: 37500571
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Abstract: The small mol., isatin, is a well-known reversible inhibitor of the monoamine oxidase (MAO) enzymes with IC50 values of 12.3 and 4.86μM for MAO-A and MAO-B, resp. While the interaction of isatin with MAO-B has been characterized, only a few studies have explored structure-activity relationships (SARs) of MAO inhibition by isatin analogs. The current study therefore evaluated a series of 14 isatin analogs as in vitro inhibitors of human MAO-A and MAO-B. The results indicated good potency MAO inhibition for some isatin analogs with five compounds exhibiting IC50 < 1μM. 4-Chloroisatin (1b) and 5-bromoisatin (1f) were the most potent inhibitors with IC50 values of 0.812 and 0.125μM for MAO-A and MAO-B, resp. These compounds were also found to be competitive inhibitors of MAO-A and MAO-B with Ki values of 0.311 and 0.033μM, resp. Among the SARs, it was interesting to note that C5-substitution was particularly beneficial for MAO-B inhibition. MAO inhibitors are established drugs for the treatment of neuropsychiatric and neurodegenerative disorders, while potential new roles in prostate cancer and cardiovascular disease are being investigated.
Keywords: competitive ; inhibition ; isatin ; monoamine oxidase ; structure-activity relationship
Purchased from AmBeed: 6341-92-0 ; 91-56-5 ; 1127-59-9 ; 611-09-6 ; 7477-63-6 ; 6344-05-4 ; 443-69-6 ; 87-48-9 ; 39603-24-2 ; 608-05-9 ; 17630-76-1 ; 20205-43-0 ; 131609-60-4 ; 150560-58-0 ; 57816-97-4 ...More
CAS No. : | 7477-63-6 | MDL No. : | MFCD00022796 |
Formula : | C8H4ClNO2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | MPLXQMMMGDYXIT-UHFFFAOYSA-N |
M.W : | 181.58 | Pubchem ID : | 344135 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91% | With acetic acid; In water; at 90℃; for 5h;Green chemistry; | General procedure: The mixture of isatin (1 mmol), 3-amino-1-phenyl-1H-pyrazol-5(4H)-one (1 mmol), 1,2-diarylethan-1-one, 2,3-dihydroinden-1-one (1 mmol) or 3,4-dihydronaphthalen-1(2H)-one (1 mmol), H2O (6 mL), HOAc (2 mL) was put in a reaction flask under 90 C about 5-7 h (monitored by TLC). After completion, the reaction mixture was cooled to room temperature and the products would be isolated out at same time. Then, compound 4 was recrystallized from DMF, however, the pure products of 6 and 8 were filtered from water, dried, without further recrystallization. |
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