A facile entry to fused pyrimidines: Preparation of pyrimido[4,5-b]quinoline and pyrido[2,3-d:6,5-d']dipyrimidine derivatives

Article abstract of DOI:10.1055/s-1992-26236

A number of pyrimido[4,5-b]quinolines 3 and pyrido[2,3-d:6,5-d']-dipyrimidines have been prepared by reaction of N,N'-disubstituted barbituric acids with the iminophosphorane derived from o-azidobenzaldehyde or 6-amino-5-formyl-1,3-dimethyluracil.