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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. : | 611-09-6 | MDL No. : | MFCD00005720 |
Formula : | C8H4N2O4 | Boiling Point : | - |
Linear Structure Formula : | (NO2)C8H4NO2 | InChI Key : | UNMYHYODJHKLOC-UHFFFAOYSA-N |
M.W : | 192.13 | Pubchem ID : | 4669250 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | N/A |
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 |
---|---|---|
86% | With 2-amino-2-hydroxymethyl-1,3-propanediol; In ethanol; at 20℃; for 4h; | General procedure: To a well-stirred solution of isatin and malononitrile(1 mmol each) in ethanol (95%, 4 mL) was added dimedone,4-hydroxycoumarin, 4-hydroxy-N-methylquinolin-2-one,or 2-methyl-pyrazol-2-one [generated in situ from ethylacetoacetate and hydrazine hydrate, 1 mmol each]. To thissolution was added THAM (30 mol %) and stirring wascontinued at ambient temperature. Upon completion of thereaction (TLC), water (5 mL) was added and stirring wascontinued for 10 min more. Resultant solid product wasfiltered, washed repeatedly with water, and dried. The dried solid was washed thrice with hexaneechloroformmixture (1:1, v/v) and dried again. Resultant product didnot require any further purification. |
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