[S:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH:10][C:11](=[O:15])[CH2:12][C:13]#[N:14].[NH4+].[Cl-].[N-:18]=[N+:19]=[N-:20].[Na+]>CN(C)C=O>[S:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[N:3]=[C:2]1[NH:10][C:11](=[O:15])[CH2:12][C:13]1[N:18]=[N:19][NH:20][N:14]=1N-(benzo[d]thiazole-2-yl)-2-cyanoacetamide (0.1 g), NH4Cl (5.0 eq, 0.1 g), and NaN3 (5.2 eq, 0.13 g) were dissolved on 2.1 mL of DMF (dimethylformamide), and heated at 120° C. for 6 hours. DMF was removed under reduced pressure distillation, and 10 ml of water and 5% NaOH solution were added thereto. The aqueous layer was washed with 15 ml of Et2O, and treated with activated carbon. To the obtained reaction mixture, 10% aqueous hydrochloric acid, making the solution with pH 2. The obtained reaction mixture was extracted with methylene chloride, to produce N-(benzo[d]thiazole-2-yl)-2-(2H-tetrazole-5-yl)acetamide (20%, 21 mg) in light yellow solid phase.
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