GRECO C. V.; GALA K. J., J. CHEM. SOC. PERKIN TRANS., PART 1, 1981, NO 2, 331-335
作者:GRECO C. V.、 GALA K. J.
DOI:——
日期:——
Meso-ionic compounds. Part 12. Synthesis of 1-alkyl-4-oxopyrimido-[1,2-a]-S-triaziniumolates and their 4-thio-derivatives
作者:Claude V. Greco、Kanti J. Gala
DOI:10.1039/p19810000331
日期:——
Treatment of 2-alkylaminopyrimidines (1) and (2) with ethoxycarbonyl isocyanate gave the acyclic urea derivatives, namely, 3-alkyl-1-ethyoxycarbonyl-3-(2-pyrimidyl)ureas (3) and (4), which cyclized to 1-alkyl-4-oxopyrimido-[1,2-a]-s-triazin-1-ium-2-olates (6) and (7) in refluxing p-xylene. Structural proof was obtained through spectral analyses, and an alternate synthesis in which (1) and (2) were