Role of the macrocyclic polyether in the synthesis of N-alkylcarbamate esters from primary amines, CO2 and alkyl halides in the presence of crown-ethers.
作者:Michele Aresta、Eugenio Quaranta
DOI:10.1016/s0040-4020(01)92239-2
日期:1992.2
Primary amines, RNH21, and CO2 easily afford monoalkylammonium N-alkylcarbamates, [RNH3][O2CNHR] 2, that have been reacted with alkyl halides, R′X, in the presence of crown-ethers to give organic carbamates in good yield. We report here the synthesis and spectroscopic characterization of some alkylammonium carbamates 2, where R = benzyl 2a, allyl 2b, ter-butyl 2c, cyclohexyl 2d, and discuss their stability
伯胺RNH 2 1和CO 2容易获得N-烷基氨基甲酸酯单烷基铵[RNH 3 ] [O 2 CNHR] 2,它们在冠醚存在下与卤代烷R'X反应生成有机物氨基甲酸酯收率高。我们在这里报告了一些氨基甲酸烷基铵2的合成和光谱表征,其中R =苄基2a,烯丙基2b,叔丁基2c,环己基2d,并讨论了它们在溶液中的稳定性以及可以与卤代烷反应生成有机氨基甲酸酯RNHC(O)OR'的条件。在修改单烷基氨基甲酸酯的反应性由大环配位起的作用2朝向R'X已经合理化和的参数,如溶剂,温度和CO的影响2压力在通往有机氨基甲酸酯的方法的产率和选择性得到了也解决了。