开发了一种用于(杂)芳基溴的光氧化还原和镍催化氨基羰基化的有效方法。利用容易获得的草酸、广泛使用的有机光氧化还原催化剂 (4CzIPN) 和温和的反应条件,使这种转化成为经典酰胺化程序的有吸引力的替代方案。在 D 2 O 存在下,通过与氢原子转移催化剂的捕获反应支持氨基甲酰基自由基的产生,产生氘代甲酰胺。对于各种草酸,证实了该氘化方案的通用性。
Reactivity of Carbamoyl Radicals. A New, General, Convenient Free-Radical Synthesis of Isocyanates from Monoamides of Oxalic Acid
作者:Francesco Minisci、Francesca Fontana、Fausta Coppa、Yong Ming Yan
DOI:10.1021/jo00122a020
日期:1995.9
A new, general, simple synthesis of isocyanates was developed by oxidation of monoamides of oxalic acid with peroxydisulfate catalyzed by Ag and Cu salts. The reaction was carried out in a two-phase system (water and an organic solvent), and it is suitable also for practical applications, due to the simple experimental conditions and the inexpensive as well as nontoxic reagents. The first example of homolytic intramolecular aromatic carbamoylation is also reported.