[NH2:1][C:2]1[N+:7]([O-:8])=[C:6]([NH2:9])[CH:5]=[C:4](Cl)[N:3]=1.CC1C=CC=CC=1C.[NH:19]1[CH2:24][CH2:23][CH:22]=[CH:21][CH2:20]1.[OH-].[Na+]>O>[NH2:1][C:2]1[N+:7]([O-:8])=[C:6]([NH2:9])[CH:5]=[C:4]([N:19]2[CH2:20][CH:21]=[CH:22][CH2:23][CH2:24]2)[N:3]=1155 g. of 2,4-diamino-6-chloropyrimidine-3-oxide are mixed and stirred under an argon atmosphere with 640 ml. of o-xylene and 260 ml. of 1,2,5,6-tetrahydropyridine. The mixture is then heated to reflux for 30 minutes, the internal temperature rising from 115° C. to 123° C. The mixture is then cooled to 5° C., treated with 40 g. of sodium hydroxide in 400 ml. of water and stirred at 5° C. for 1 hour. The precipitate formed is filtered off, washed with 200 ml. of water and recrystallized from 3000 ml. of water, there being obtained pure 2,4-diamino-6-[3,6-dihydro-1(2H)-pyridyl]pyrimidine-3-oxide having a melting point of 263°-265° C. (decomposition).
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