[C:1](Cl)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:10][N+:11]#[C-:12].[N-:13]=[N+:14]=[N-:15].[Na+].O>C(#N)C.C(OCC)(=O)C>[CH3:12][N:11]1[C:10]([C:1](=[O:8])[C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=2)=[N:15][N:14]=[N:13]1
At room temperature, 10 g of benzoyl chloride (71 mmol) were admixed with 3.7 g (92 mmol) of methyl isocyanide. The mixture was then heated at 60° C. for 2 hours. The mixture was admixed with 25 ml of acetonitrile and cooled to 0° C. This reaction mixture was added to 4.6 g of sodium azide (71 mmol) in 25 ml of acetonitrile at 0° C. The mixture was then heated to 60° C. to 65° C. and stirred at this temperature for 16 hours. At room temperature, 100 ml of water and 100 ml of ethyl acetate were added to the mixture. The organic phase was separated off and the aqueous phase was extracted with 100 ml of ethyl acetate. The combined organic phases were dried over magnesium sulphate and the solvent was removed in vacuo. The crude product could be recrystallized from 20 ml of isopropanol, giving 8.7 g of 1-methyl-5-benzoyltetrazole (purity 99.4%). This corresponds to a yield of 65%, based on the acid chloride used.
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