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。