An efficient procedure for the synthesis of trisubstituted pyrazoles was developed. Claisen-Schmidt condensation of 2,4,5-trimethoxybenzaldehyde and substituted acetophenone in the presence of aqueous alkaline bases produced chalcones. The cyclocondensation reaction of chalcones and phenyl hydrazine hydrochloride catalyzed by an acid produced trisubstituted pyrazolines in good yields. The synthesized new compounds were characterized by spectral studies and elemental analysis and some of the intermediate chalcones by single crystal X-ray diffraction studies. The compounds were screened in vitro for their antimicrobial susceptibilities against different bacteria and fungi species.
开发了一种合成三取代
吡唑的高效工艺。在含
水碱性条件下,
2,4,5-三甲氧基苯甲醛与取代
苯乙酮进行克莱森-施密特缩合反应,生成
查耳酮。在酸催化下,
查耳酮与苯
肼盐酸盐发生环化缩合反应,以良好产率生成三取代
吡唑啉。通过光谱研究和元素分析对合成的新化合物进行了表征,部分中间体
查耳酮通过单晶X射线衍射研究进行了鉴定。对这些化合物进行了体外抗菌活性筛选,测试了它们对不同细菌和真菌种类的抗菌敏感性。