摘要:
The carbodiimides 3, obtained from aza-Wittig reactions of the corresponding iminophosphorane 2 with 1 equiv. of aromatic isocyanates, were allowed to react in the presence of a catalytic amount of potassium carbonate or EtO-Na+ with p-fluorothiophenol to give 5,6-disubstituted 1,2,3-triazolo[4,5-d]-pyrimidine-7-ones 5 in satisfactory yields. Further reaction of compounds 5 with H2O2 or Na2WO4/H2O2 generated the corresponding compounds 6 and 7 in good yields, respectively.