Bicyclic pyrimidine derivatives with a bridgehead nitrogen atom—III
作者:A.H. Beckett、R.G.W. Spickett、S.H.B. Wright
DOI:10.1016/s0040-4020(01)98693-4
日期:1968.1
C-Alkyl-s-triazolo[4.3-a]pyrimidines are distinguished from the s-triazolo[1.5-a]pyrimidines by their UV absorption at longer wavelength. The UV spectra (at pH2 and pH10) also differentiate the isomeric s-triazolopyrimidones (hydroxy-s-triazolopyrimidines); this differentiation may be confirmed by the IR stretching frequency of the CO group. The isomeric N-alkyl-s-triazolopyrimidones are more readily