Synthesis of Unsymmetrical Ureas by Sulfur-Assisted Carbonylation with Carbon Monoxide and Oxidation with Molecular Oxygen under Mild Conditions
作者:Takumi Mizuno、Takeo Nakai、Masatoshi Mihara
DOI:10.1055/s-0029-1216863
日期:2009.8
pressure of carbon monoxide and oxygen at room temperature, N,N-dialkyl-N′-arylureas were selectively accessible from secondary amines, aromatic amines, and sulfur in good to excellent yields. For example, N-butyl-N-methyl-N′-(3,4-dichlorophenyl)urea, which is used as a herbicide (neburon), was afforded successfully from butylmethylamine (2 equiv), 3,4-dichloroaniline (1 equiv) and sulfur (1 equiv) in
在室温下一氧化碳和氧气的环境压力下,N,N-二烷基-N'-芳基脲可以良好或极好的收率选择性地从仲胺,芳族胺和硫中获得。例如,成功地从丁基甲胺(2当量),3,4-二氯苯胺(1)获得了用作除草剂(尼布隆)的N-丁基-N-甲基-N '-(3,4-二氯苯基)脲。当在20°C的DMF中使用一氧化碳(0.1 MPa)和氧气(0.1 MPa)时,产率为79%(21.8 g),硫(1当量)。 不对称脲-一氧化碳-氧-硫-除草剂