[C:1]([CH2:3][CH2:4][NH:5][C:6]([C:8]1[CH:9]=[C:10]([CH:15]=[CH:16][CH:17]=1)[C:11]([O:13][CH3:14])=[O:12])=O)#[N:2].[N-:18]=[N+:19]=[N-:20].[Na+].C([O-])(O)=O.[Na+].CCOC(C)=O>CC#N>[C:1]([CH2:3][CH2:4][N:5]1[C:6]([C:8]2[CH:9]=[C:10]([CH:15]=[CH:16][CH:17]=2)[C:11]([O:13][CH3:14])=[O:12])=[N:20][N:19]=[N:18]1)#[N:2]Preparation H7, Step 2: To a soultion of methyl 3-((2-cyanoethyl)carbamoyl)benzoate (400 mg, 1.7 mmol) in MeCN (15 mL) at 0° C. was added NaN3 (111 mg, 1.7 mmol), and Tf20 (0.3 mL, 1.7 mmol). The mixture was stirred at rt for 16 h before aq NaHCO3 and EtOAc were added. The organic layer was separated and re-washed twice before it was collected, dried over Na2SO4, and concentrated to methyl 3-(1-(2-cyanoethyl)-1H-tetrazol-5-yl)benzoate as an oil (180 mg, 41% yield). MS found: (M+H)+=258.
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