[CH3:1][C:2]1[S:3][C:4]([CH3:18])=[C:5]2[C:10]=1[C:9](=[O:11])[N:8]1[CH:12]=[C:13]([C:16]#[N:17])[CH:14]=[CH:15][C:7]1=[N:6]2.[N-:19]=[N+:20]=[N-:21].[Na+].[Cl-].[NH4+].C>CN(C)C=O.N1C=CC=CC=1>[CH3:1][C:2]1[S:3][C:4]([CH3:18])=[C:5]2[C:10]=1[C:9](=[O:11])[N:8]1[CH:12]=[C:13]([C:16]3[NH:21][N:20]=[N:19][N:17]=3)[CH:14]=[CH:15][C:7]1=[N:6]2A mixture of 4.4 g (0.0172 mol) of 1,3-dimethyl-10-oxo-10H-pyrido-[1,2-a]thieno[3,4-d]pyrimidine-7-carbonitrile (Example 51), 6.5 g (0.1 mol) of sodium azide and 5.3 g (0.1 mol) of ammonium chloride in 180 ml of dimethylformamide is stirred and heated in a wax bath at 120° C. for seventeen hours under nitrogen. The reaction mixture is cooled, filtered and the filtrate evaporated. The residue is treated with 250 ml of water and acidified with concentrated hydrochloric acid. This mixture is warmed on a steam bath, cooled and filtered to give 5.1 g of crude product. This material is dissolved in hot pyridine, activated charcoal (Darco-G60, Matheson, Coleman and Bell) is added and the hot suspension is filtered through Supercell Hyflo® (Johns-Mansville). The filtrate is cooled to give 3.1 g of 1,3-dimethyl-7-(1H-tetrazol-5-yl)-10H-pyrido[1,2-a]thieno-[3,4-d]pyrimidin-10-one; mp 292° C. (dec).
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