Sodium Azide → 4,5-Dihydro-7-(3,4-dimethoxyphenyl)-4-methyl-5-(2,4,6-trimethylphenylimino)tetrazolo[1,5-a]pyrimidine

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To a suspension of 2-chloro-3,4-dihydro-6-(3,4-dimethoxyphenyl)-3-methyl-4-(2,4,6-trimethylphenylimino)pyrimidine (1.0 g) in a mixture of methanol (9 ml) and water (1.5 ml) was added sodium azide (0.163 g). The mixture was stirred at 50° to 55° C. for an hour. After removal of the solvent, the residue was washed with water and collected by filtration to give 4,5-dihydro-7-(3,4-dimethoxyphenyl)-4-methyl-5-(2,4,6-trimethylphenylimino)tetrazolo[1,5-a]pyrimidine (0.80 g).

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