A simple and efficient biphasic method for the preparation of 4-nitrophenyl N-methyl- and N-alkylcarbamates
作者:Matt A. Peterson、Houguang Shi、Pucheng Ke
DOI:10.1016/j.tetlet.2006.03.075
日期:2006.5
interest is the observation that 4-nitrophenyl N-methylcarbamate, a safer alternative to the highly toxic methyl isocyanate, is obtained in quantitative yield (⩾95% pure as determined by 1H NMR) after simple filtration and solvent evaporation.
用烷基铵盐酸盐和固体无水Na 2 CO 3在CH 2 Cl 2或CH 3 CN中处理4-硝基苯基氯甲酸酯,可得到4-硝基苯基N-甲基氨基甲酸酯和其他N-烷基氨基甲酸酯类似物,收率极高。特别令人感兴趣的是观察到,在简单过滤和溶剂蒸发后,可以定量收率获得纯度较高(按1 H NMR测定纯度约为95%)的4-硝基苯基N-甲基氨基甲酸酯,这是剧毒甲基异氰酸酯的安全替代品。