继续我们对合成具有预期生物活性特别是抗肿瘤活性的新型杂环的兴趣。在本文中,我们讨论了1,3-二苯基吡唑-4-甲醛4与苯乙酮衍生物1a-d,活性亚甲基化合物,肼和苯胺衍生物的合成和反应,以产生预期的衍生物5a-d。另外,在三乙胺的催化下,通过1,3-二苯基吡唑-4-甲醛1,丙二腈和硫醇衍生物13a-e的一锅三组分环缩合反应,合成了一系列五取代的吡啶衍生物15a-e。 。另外,由N-((1,3-二苯基-1H-吡唑)合成了2-(1,3-二苯基-1H-吡唑-4-基)-3-(芳基)噻唑烷-4-one 20a-e。 -4-基)亚甲基苯胺衍生物11a-e和巯基乙酸。筛选了一些合成的衍生物的抗肿瘤活性。所有新合成的化合物均已通过元素分析,IR,1 H NMR,13 C NMR,MS进行了表征,并在某些情况下通过与化合物的已知特性进行比较或与通过报告明确的路线制备的样品进行比较。
One-Pot Synthesis of Some New Semicarbazone, Thiosemicarbazone, and Hydrazone Derivatives of 1-Phenyl-3-Arylpyrazole-4-Carboxaldehyde from Acetophenone Phenylhydrazones Using Vilsmeier–Haack Reagent
Abstract Semicarbazone derivatives 3 of 1,3-diphenylpyrazole-4-carboxaldehyde have been synthesized in high yields through a one-pot procedure involving acetophenone phenylhydrazones 1 subjected to Vilsmeier double formylation and workup under new conditions (i.e., treatment with semicarbazide followed by sodium bicarbonate). This method is even suitable for preparing other derivatives (i.e., thiosemicarbazones
Sulfamic acid as a green, reusable catalyst for stepwise, tandem & one-pot solvent-free synthesis of pyrazole derivatives
作者:Veera Swamy Konkala、Pramod Kumar Dubey
DOI:10.1016/j.cclet.2017.02.005
日期:2017.7
Abstract Sulfamic acid (SA) is a bi-functional, cost-effective and reusable green catalyst for the synthesis of 4-(pyrazol-4-yl)methylenepyrazol-5(4 H )-one derivatives by one-pot, three-component condensation of pyrazol-4-carbaxaldehydes, β -ketoesters and phenyl hydrazine (Route-I). In addition to this method, another simple condensation of pyrazol-4-carbaxaldehydes with pyrazolone in the presence