In order to develop new anti-Helicobacterpyloriagents, a series of N1-substituted 3,5-diphenyl pyrazolines P1-P13 was prepared and evaluated for their antibacterial activity. All synthesized compounds showed little or no activity against different species of Gram-positive and Gram-negative bacteria of clinical relevance and against various strains of pathogenic fungi. The same derivatives exhibited
为了开发新的抗幽门螺杆菌药物,制备了一系列N1取代的3,5-二苯基吡唑啉P1-P13,并对其抗菌活性进行了评估。所有合成的化合物对具有临床相关性的不同种类的革兰氏阳性细菌和革兰氏阴性细菌以及各种病原真菌菌株都几乎没有或没有活性。相同的衍生物对一系列幽门螺杆菌菌株(包括对参考化合物甲硝唑有抗性的菌株)表现出显着的活性。在所制备的化合物中,在5-苯环中具有N1-乙酰基和4-甲氧基取代基的化合物在1-4 microg / mL MIC范围内显示出对幽门螺杆菌甲硝唑耐药菌株的最佳活性。
Synthesis and Selective Inhibitory Activity of 1-Acetyl-3,5-diphenyl-4,5-dihydro-(1<i>H</i>)-pyrazole Derivatives against Monoamine Oxidase
A novel series of 1-acetyl-3-(4-hydroxy- and 2,4-dihydroxyphenyl)-5-phenyl-4,5-dihydro-(1H)-pyrazole derivatives 1 - 12 have been synthesized and investigated for the ability to selectively inhibit the activity of the A and B isoforms of monoamine oxidase (MAO). The new synthesized compounds 1-12 proved to be more reversible, potent, and selective inhibitors of MAO-A than of MAO-B. Knowing that stereochemistry may be an important modulator of biological activity, we performed the semipreparative chromatographic enantioseparation of the most potent, selective, and chiral compounds, 6 and 11. The separated enantiomers were then submitted to in vitro biological evaluation while increasing their inhibitory activity and A selectivity. The (-)-6 enantiomer shows Ki(MAO-A) 2 nM and SI = 165 000, (+)-6 shows Ki(MAO-A) = 6 nM and SI = 166 666, (-)-11 shows Ki(MAO-A) = 4 nM and SI = 80 000, and (+)-11 shows Ki(MAO-A) = 7 nM and SI = 38 571.