Palladium-Catalyzed Cyanomethylation of Aryl Halides through Domino Suzuki Coupling–Isoxazole Fragmentation
作者:Juraj Velcicky、Arne Soicke、Roland Steiner、Hans-Günther Schmalz
DOI:10.1021/ja201743j
日期:2011.5.11
cyanomethylation of aryl halides through a palladium-catalyzed reaction with isoxazole-4-boronic acid pinacol ester was developed. Mechanistically, the reaction proceeds through (1) Suzuki coupling, (2) base-induced fragmentation, and (3) deformylation as shown by characterization of all postulated intermediates. Under optimized conditions (PdCl(2)dppf, KF, DMSO/H(2)O, 130 °C) a broad spectrum of aryl bromides could
开发了一种通过钯催化反应与异恶唑-4-硼酸频哪醇酯进行氰基甲基化芳基卤化物的一锅法。从机制上讲,反应通过 (1) Suzuki 偶联、(2) 碱基诱导断裂和 (3) 去甲酰化进行,如所有假定中间体的表征所示。在优化条件下(PdCl(2)dppf、KF、DMSO/H(2)O、130 °C),广谱的芳基溴化物可以转化为芳基乙腈,产率高达 88%。