synthesis of N-aryl carbamates from N-Boc-protected amines has been developed. The cobalt-catalyzed in situ generation of isocyanates from N-Boc-protected amines and benzyl alcohols from benzyl formates has been achieved for the first time, which in turn furnished the corresponding benzyl carbamates in moderate to high yields. The reaction was catalyzed by CoI2 with tris-(4-dimethylaminophenyl)-phosphine
已经开发了由N-Boc保护的胺合成N-芳基
氨基甲酸酯的有效方法。首次实现了由N-Boc保护的胺进行
钴催化的原位生成
异氰酸酯和由苄基
甲酸酯生成的
苄醇,这反过来又以中等至高收率提供了相应的
氨基甲酸苄酯。CoI 2以三-(4-二甲基
氨基苯基)-膦为
配体,
锌粉为还原剂催化反应。发现所开发的反应条件对于具有给电子取代基和吸电子取代基的芳族胺是相容的。