3,5-[5-Arylisoxazol-3-yl(4,5-dichloroisothiazol-3-yl)]-substituted 1,2,4- and 1,3,4-oxadiazoles: synthesis, palladium complexes, and catalysis of Suzuki reactions in aqueous media
作者:Nikolay A. Bumagin、Sergey K. Petkevich、Alexey V. Kletskov、Vladimir I. Potkin
DOI:10.1007/s10593-018-2216-z
日期:2017.12
involving transformations of 5-(4-methylphenyl)isoxazole and 4,5-dichloroisothiazole derivatives containing an amidoxime group at position 3 allowed to synthesize the respective 3,5-isoxazolyl(isothiazolyl)-substituted 1,2,4-oxadiazoles. Selective recyclization of 4,5-dichloro-3-(1Н-tetrazol-5-yl)isothiazole and 5-(4-methylphenyl)-3-(1Н-tetrazol-5-yl)isoxazole gave 2,5-isoxazolyl-(isothiazolyl)-substituted
涉及转化5-(4-甲基苯基)异恶唑和4位在位置3处含有a肟基的4,5-二氯异噻唑衍生物的反应序列,可以合成各自的3,5-异恶唑基(异噻唑基)取代的1,2,4-恶二唑。4,5-二氯-3-(1-选择性再成环Н -四唑-5-基)异噻唑和5-(4-甲基苯基)-3-(1- Н -四唑-5-基)异恶唑,得到2,5-异恶唑基-(异噻唑基)取代的1,3,4-恶二唑。所获得的化合物在一个分子中结合了三个唑杂环,形成了钯配合物,该钯配合物在水性和水性醇介质中的Suzuki反应中显示出高催化活性。由钯聚唑配合物获得的双金属可重复使用的Pd / Fe催化剂经过五次使用后仍保持了较高的催化活性。