Synthesis and Antimicrobial Evaluation of Novel Pyrazolones and Pyrazolone Nucleosides
作者:Abdalla E. A. Hassan、Ahmed H. Moustafa、Mervat M. Tolbah、Hussein F. Zohdy、Abdelfattah Z. Haikal
DOI:10.1080/15257770.2012.732250
日期:2012.11
The synthesis of a novel series of 4-arylhydrazono-5-methyl-1,2-dihydropyrazol-3-ones 4a–h, and their N 2-alkyl and acyclo, glucopyranosyl, and ribofuranosyl derivatives is described. K2CO3 catalyzed alkylation of 4a–h with allyl bromide, propargyl bromide, 4-bromobutyl acetate, 2-acetoxyethoxymethyl bromide, and 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide proceeded selectively at the N 2-position
描述了一系列新的4-芳基肼基-5-甲基-1,2-二氢吡唑-3-酮4a–h以及它们的N 2-烷基和无环,吡喃吡喃糖基和呋喃呋喃糖基衍生物的合成。K2CO3用烯丙基溴,炔丙基溴,乙酸4-溴丁酯,2-乙酰氧基乙氧基甲基溴和2,3,4,6-四-O-乙酰基-α-D-吡喃葡萄糖基溴在4a–h上进行烷基化吡唑啉酮环的2位。在Vorbruggen糖基化条件下用1,2,3,5-四-O-乙酰基-β-D-呋喃呋喃糖将4a糖基化,得到相应的N 2-4-芳基肼基吡唑啉酮呋喃糖苷9a,收率良好。乙酰基保护的核苷的常规脱保护以良好的产率提供了相应的4-芳基肼基吡唑啉酮核苷。筛选了一些新合成的化合物的抗微生物活性。化合物4b,12a和14d对黄曲霉,青霉属和大肠杆菌具有中等活性。