Ru(OAc)2(p-cymene) catalyses the directed dehydrogenative alkenylation of N-aryl pyrazoles by styrene and alkyl acrylates in the presence of a catalytic or stoichiometric amount of Cu(OAc)2·H2O in air; the acetic acid solvent plays a key role. With arene electron-donating groups, ruthenium-catalysed ortho-dialkenylation with alkyl acrylates can be obtained. A new method to generate the oxidative homocoupling of N-phenylpyrazole is provided with the Ru(OAc)2(p-cymene) catalyst.
Ru(OAc)2(p-cymene) 在空气中催化
苯乙烯和
丙烯酸烷基酯对 N-芳基
吡唑的定向脱氢烯基化反应,催化剂中的 Cu(OAc)2Â-
H2O 在催化或一定量的情况下存在;
乙酸溶剂起着关键作用。有了炔电子供体基团,就能获得
钌催化的烷基
丙烯酸酯正二烯酸化反应。Ru(OAc)2(p-cymene) 催化剂提供了一种生成 N-苯基
吡唑氧化偶联反应的新方法。