Cl[C:2]1[C:11]2[CH2:10][CH2:9][CH2:8][CH2:7][C:6]=2[C:5]2=[N:12][N:13]=[N:14][N:4]2[N:3]=1.[CH3:15][NH2:16]>CO>[CH3:15][NH:16][C:2]1[C:11]2[CH2:10][CH2:9][CH2:8][CH2:7][C:6]=2[C:5]2=[N:12][N:13]=[N:14][N:4]2[N:3]=1A mixture of 6.0 g of 6-chloro-7,8,9,10-tetrahydrotetrazolo[5,1-a]phthalazine and 125 ml of 40% aqueous methylamine in 15 ml of methanol was heated under reflux for 3 hours. The reaction mixture was then cooled and the crystalline solid present was separated by filtration. It was recrystallized from a mixture of dimethylsulfoxide and water to give 6-methylamino-7,8,9,10-tetrahydrotetrazolo[5,1-a]phthalazine melting at about 318° C.
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