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
Synthesis of 6-cyanopurines and the isolation and X-ray structure of novel 2<i>H</i>-pyrroles
作者:M. José Alves、M. Alice Carvalho、M. Fernanda J.R.P. Proença、Brian L. Booth、Robin G. Pritchard
DOI:10.1002/jhet.5570340306
日期:1997.5
2-dicyanovinyl)-N2-substituted-formainidines react with dimethylformamide diethyl acetal at room temperature to give 6-cyanopurines as the major product together with novel 5-amino-2-arylimino-3,4-di[(N,N-dimethylamino)methylideneamino]-2H-pyrroles, which have been fully characterised and a single crystal X-ray analysis has been carried out on the N-phenyl derivative.