The HPLC enantiomer separation of a novel series of C(5)-chiral 1-acetyl-3-(4-hydroxy- and 2,4-dihydroxyphenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole derivatives, with inhibitory activity against monoamine oxidases (MAO) type A and B, was accomplished using polysaccharide-based chiral stationary phases (CSPs: Chiralpak AD, Chiralcel OD, and Chiralcel OJ). Pure alcohols, such as ethanol and 2-propanol, and typical normal-phase binary mixtures, such as n-hexane and alcohol modifier, were used as mobile phases. Single enantiomers of several analytes examined were isolated on a semipreparative scale, and their chiroptical properties were measured. The assignment of the absolute configuration was established for one compound by single-crystal X-ray diffraction method and for the other three by CD spectroscopy. The inhibitory activity against MAO of racemic samples and single enantiomers were evaluated in vitro.
Pyrrolylethanoneamines 1-12, 18-23 and related amino alcohols 13-15, 24-27 were synthesized and tested against monoamine oxidases A and B (MAO-A and MAO-B) enzymes. In general, aminoketones 1-12, 18-23 were found to be potent and selective MAO-A inhibitors. In particular, 18 was more potent and selective against the MAO-A isoenzyme than reference drugs. Interestingly, amino alcohol 25 selectively inhibited MAO-B enzyme and could be a lead compound for designing more potent and selective MAO-B inhibitors.
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