The synthesis of carbamates from reactions of primary and secondary aliphatic amines with dimethyl carbonate in ionic liquids

摘要

At 170degC and using ionic liquids as solvent and catlayst,primary and secondary aliphatic amines could react with dimethyl carbonate to give alkyl carbamates with good yield.Due to its insolubility,the desired carbamate solid could be recovered by simple filtration from the two-layer mixture of dimethyl carbonate and ionic liquid after reaction and the formation of N-methylated and demmoniated products were restrained.