Synthesis of (Z )-N-(2-amino-1,2-dicyanovinyl)formamide O-alkyloximes and a study of their cyclization in the presence of base
作者:Brian L. Booth、Flora A. T. Costa、Zahid Mahmood、Robin G. Pritchard、M. Fernanda Proença
DOI:10.1039/a901332f
日期:——
The title compounds (3) have been prepared in high yield by reaction of (Z)-N-(2-amino-1,2-dicyanovinyl)formimidate with an alkoxyamine NH2OR (R = CH2Ph, Me). These compounds cyclize to the corresponding 5-amino-4-cyanoimidazoles 4 by reaction with ethanolic NaOH solution. In ethyl acetate and using DBU as a base, amidoximes 3 follow an unexpected cyclization pathway leading to a pyrimidine structure