反应详情

4-Bromophenylacetonitrile (30.0 g, 0.15 mol), sodium azide (10.9 g, 0.17 mol) and ammonium chloride (8.9 g, 0.17 mol) were heated in DMF (300 mL) at 90° C. for 2 days. After concentration, water (200 mL) was added to the residue, the mixture was basified with 1M NaOH (170 mL) and washed with ether (2×100 mL). Acidification of the aqueous layer with 1N HCl and collection of the precipitate by suction filtration produced the crude product. This was purified by recrystallization from ethanol to provide 5-[(4-bromophenyl)methyl]-2H-tetrazole (17.2 g, 0.07 mol) in 44% yield, mp. 173°-175° C.

1. concentrationAfter concentration, water (200 mL)
2. additionwas added to the residue
3. washwashed with ether (2×100 mL)
4. customAcidification of the aqueous layer with 1N HCl and collection of the precipitate
5. filtrationby suction filtration
6. customproduced the crude product
7. customThis was purified by recrystallization from ethanol