<i>N</i>-Methylimidazole-catalyzed Synthesis of Carbamates from Hydroxamic Acids via the Lossen Rearrangement
作者:Sabesan Yoganathan、Scott J. Miller
DOI:10.1021/ol303424b
日期:2013.2.1
An efficient, one-pot, N-methylimidazole (NMI) accelerated synthesis of aromatic and aliphatic carbamates via the Lossen rearrangement is reported. NMI is a catalyst for the conversion of isocyanate intermediates to the carbamates. Moreover, the utility of arylsulfonyl chloride in combination with NMI minimizes the formation of often-observed hydroxamate-isocyanate dimers during the sequence. Under
报道了一种有效的、一锅法、N-甲基咪唑 (NMI) 通过 Lossen 重排加速合成芳香族和脂肪族氨基甲酸酯的方法。NMI 是将异氰酸酯中间体转化为氨基甲酸酯的催化剂。此外,芳基磺酰氯与 NMI 组合的效用最大限度地减少了在序列过程中经常观察到的异羟肟酸酯-异氰酸酯二聚体的形成。在目前的条件下,降低温度也是可能的,从而实现温和的协议。