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An efficient low-temperature stille-migita cross-coupling reaction for heteroaromatic compounds by Pd-PEPPSI-IPent

机译:Pd-PEPPSI-IPent用于杂芳族化合物的高效低温stille-migita交叉偶联反应

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摘要

The reactivity of Pd-PEPPSI (Pyridine, Enhanced, Precatalyst, Preparation, Stabilization, and Initiation) precatalysts in the Stille-Migita crosscoupling reaction between heteroaryl stannanes and aryl or heteroaryl halides was evaluated. In general, PdPEPPSI-IPent (IPent = diisopentylphenylimidazolium derivative) demonstrated high efficiency over a variety of challenging aryl or heteroaryl halides with thiophene-, furan-, pyrrole-, and thiazole-based organostannanes when compared with Pd-PEPPSI-IPr (IPr = diisopropylphenylimidazolium derivative). The transformations proceeded at appreciably lower temperatures (3080°C) than triarylphosphine-based Pd catalysts, improving the scope of this useful carbon-carbon bond-forming process.
机译:评估了杂芳基锡烷与芳基或杂芳基卤化物之间的Stille-Migita交联反应中Pd-PEPPSI(吡啶,增强型,预催化剂,制备,稳定化和引发反应)预催化剂的反应性。通常,与Pd-PEPPSI-IPr(IPr =二异丙基苯基咪唑鎓衍生物)。与基于三芳基膦的Pd催化剂相比,该转化过程在较低的温度(3080°C)下进行,从而改善了这种有用的碳-碳键形成过程的范围。

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