Further studies on the ring transformation of pyrimido[5,4-e]-as-triazine 4-oxides to pyrrolo[3,2-d]pyrimidines involving 1,3-dipolar cycloaddition reaction
Further studies on the ring transformation of pyrimido[5,4-e]-as-triazine 4-oxides to pyrrolo[3,2-d]pyrimidines involving 1,3-dipolar cycloaddition reaction