Nickel-Catalyzed Decarboxylation of Aryl Carbamates for Converting Phenols into Aromatic Amines
作者:Akihiro Nishizawa、Tsuyoshi Takahira、Kosuke Yasui、Hayato Fujimoto、Tomohiro Iwai、Masaya Sawamura、Naoto Chatani、Mamoru Tobisu
DOI:10.1021/jacs.9b02751
日期:2019.5.8
to accessing aromatic amines from an abundant feedstock, namely phenols. The most reliable catalytic method for converting phenols to aromatic amines uses an activating group, such as a trifluoromethane sulfonyl group. However, this activating group is eliminated as a leaving group during the amination process, resulting in significant waste. Our nickel-catalyzed decarboxylation reaction of aryl carbamates
在此,我们描述了一种从丰富的原料(即苯酚)中获取芳香胺的新催化方法。将酚类转化为芳香胺的最可靠的催化方法是使用活化基团,例如三氟甲磺酰基。然而,该活化基团在胺化过程中作为离去基团被消除,导致大量浪费。我们的镍催化的氨基甲酸芳基酯脱羧反应形成芳香胺,二氧化碳作为唯一的副产物。由于这种胺化在没有游离胺的情况下进行,包括甲酰基在内的一系列官能团是相容的。固定在聚苯乙烯载体 (PS-DPPBz) 上的双膦配体是该反应成功的关键,产生的催化物种比简单的非载体变体活性明显更高。