[NH2:1][C:2]1[N:3]=[C:4]2[S:14][C:13]([C:15]3[CH:20]=[CH:19][C:18]([C:21]([CH3:24])([CH3:23])[CH3:22])=[CH:17][CH:16]=3)=[N:12][N:5]2[C:6](=[O:11])[C:7]=1[N+:8]([O-])=O.C(O)(=O)C>CN(C)C=O.[C].[Pd]>[NH2:8][C:7]1[C:6](=[O:11])[N:5]2[N:12]=[C:13]([C:15]3[CH:16]=[CH:17][C:18]([C:21]([CH3:23])([CH3:22])[CH3:24])=[CH:19][CH:20]=3)[S:14][C:4]2=[N:3][C:2]=1[NH2:1]2.75 g of 7-amino-2-(4-tert-butylphenyl)-6-nitro-5H-[1,3,4] thiadiazolo[3,2-a]pyrimidin-5-one was dissolved in 200 ml of warmed dimethylformamide, and 20 ml of acetic acid and 2.0 g of 5% palladium-carbon were added to the solution. Catalytic reduction was carried out at a temperature of 40° to 60° C. After the calculated amount of hydrogen was absorbed, the catalyst was removed by filtration while hot, and the filtrate was concentrated under reduced pressure. The precipitate formed was separated by filtration to obtain 2.0 g of 6,7-diamino-2-(4-tert-butylphenyl)-5H-[1,3,4]thiadiazolo[3,2-a]pyrimidin-5-one as yellow needles.
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