A method to synthesize 2-methylbenzoxazoles directly from N-phenylacetamides catalyzed by Pd(OAc)2 in the presence of K2S2O8 and TfOH has been developed. The desired products were obtained in moderate to excellent yields. This approach provides a facile procedure to prepare benzoxazoles with available substrates. It is found that TfOH is the key factor for this cyclization reaction. A plausible mechanism
已经开发了一种在K 2 S 2 O 8和TfOH存在下,由Pd(OAc)2催化的N-苯基乙酰胺直接合成2-甲基苯并恶唑的方法。以中等至优异的产率获得了所需的产物。这种方法提供了一种简便的方法来制备具有可用底物的苯并恶唑。发现TfOH是该环化反应的关键因素。根据控制反应和文献,提出了合理的反应机理。