Efficient Synthesis of 4,4‘-Bi-1<i>H</i>-imidazol-2-ones from 5-Amino-α-imino-1<i>H</i>-imidazole-4-acetonitriles and Isocyanates
作者:Alice M. Dias、Isabel Cabral、M. Fernanda Proença、Brian L. Booth
DOI:10.1021/jo011192z
日期:2002.8.1
of a catalytic amount of DBU (1,8-diazabicyclo[5.4.0]undec-7-ene). The reaction of the N-arylamidine 6b, the synthetic precursor of the imidazole 1b, with benzyl isocyanate also led to the formation of 4,4'-bi-1H-imidazol-2-one 3b in quantitative yield. The imidazole intermediate 2b has been isolated and found to be identical with the compound obtained by reaction of the imidazole 1b and benzyl isocyanate