苯酚衍生物由可带有多种取代基的非芳香环化合物制备。芳香分子是许多药物、电子材料和日用塑料的关键成分。这些分子的效用直接反映了芳环上取代基的身份和模式。在这里,我们报告了一种钯 (II) 催化剂体系,结合了非常规的邻二甲氨基吡啶配体,用于将取代的环己酮转化为相应的酚类。该反应通过六元环的两个饱和碳-碳键的连续脱氢进行,并使用分子氧作为氢受体。
Pd-Catalyzed Semmler–Wolff Reactions for the Conversion of Substituted Cyclohexenone Oximes to Primary Anilines
作者:Wan Pyo Hong、Andrei V. Iosub、Shannon S. Stahl
DOI:10.1021/ja4073172
日期:2013.9.18
Homogeneous Pd catalysts have been identified for the conversion of cyclohexenone and tetralone O-pivaloyl oximes to the corresponding primary anilines and 1-aminonaphthalenes. This method is inspired by the Semmler-Wolff reaction, a classic method that exhibits limited synthetic utility owing to its forcing conditions, narrow scope, and low product yields. The oxime N-O bond undergoes oxidative addition to Pd-0(PCy3)(2), and the product of this step has been characterized by X-ray crystallography and shown to undergo dehydrogenation to afford the aniline product.