CN(C=O)C.S(Cl)(Cl)=O.[NH:10]1[C:14]([C:15]([OH:17])=O)=[N:13][N:12]=[N:11]1.[N:18]1[CH:23]=[CH:22][CH:21]=[C:20]([C:24]2[S:25][CH:26]=[C:27]([NH2:29])[N:28]=2)[CH:19]=1.Cl>C(#N)C.N1C=CC=CC=1.O.C1C=CC=CC=1>[N:18]1[CH:23]=[CH:22][CH:21]=[C:20]([C:24]2[S:25][CH:26]=[C:27]([NH:29][C:15]([C:14]3[NH:13][N:12]=[N:11][N:10]=3)=[O:17])[N:28]=2)[CH:19]=1A mixture, obtained oy adding dry DMF (0.197 ml, 2.63 mmol) and then thionyl chloride (0.192 ml, 2.63 mmol) to dry benzene (1 ml) under ice-cooling, was allowed to warm up to room temperature and to react for 10 minutes upon which the mixture separated into two layers. The lower layer was added dropwise to dipotassium salt of 1H-tetrazole-5-carboxylic acid (333 mg, 1.75 mmol) suspended in dry acetonitrile (5 ml) under ice-cooling. The mixture was allowed to react for 15 minutes. After adding dropwise a mixed solution of 2-(3-pyridyl)4-thiazolamine (330 mg, 1.86 mmol) in dry acetonitrile (3 ml) and dry pyridine (1 ml) under the same conditions, the mixture was allowed to warm up to room temperature and to react for 1 hour. After dissolution was effected with addition of water, the reaction mixture was neutralized under ice-cooling with 2N-HCl to pH 7. The deposited solids were filtered with suction, was recrystallized from methanol-THF-water to give yellow crystals (181 mg, yield 38%) of N-(2-(3-pyridyl)-4-thiazolyl)-1H-tetrazole-5-carboxamide (Ia-23), m.p. 263°-265° C.
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