[NH:1]([C:3]1[N:12]=[C:11]([C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([Cl:19])[CH:9]=2)[N:4]=1)[NH2:2].[CH:20]([O-])([O-])OCC.S(=O)(=O)(O)O.C(=O)(O)[O-].[Na+]>C(O)C>[C:13]1([C:11]2[C:10]3[C:5](=[CH:6][CH:7]=[C:8]([Cl:19])[CH:9]=3)[N:4]3[CH:20]=[N:2][N:1]=[C:3]3[N:12]=2)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1To a suspension of 2.0 g of 2-hydrazino-4-phenyl-6-chloroquinazoline in 50 ml of ethanol were added 5.5 g of ethyl orthoformate and 1 ml of concentrated sulfuric acid. The resulting mixture was stirred at room temperature for 1 hour and then 30 ml of dilute sodium bicarbonate solution was added thereto. The resulting crystals were collected by filtration and recrystallized from ethanol to give 5-phenyl-7-chloro-s-triazolo[4,3-a]quinazoline as colorless needles, m.p. 295° - 297° C.
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