反应详情

A mixture of ethyl[5-(1H-tetrazol-1-yl)pyrazin-2-yl]acetate (2.0 g, 8.5 mmol) in 60 mL of THF/MeOH/H2O (2:2:1) was added LiOH.H2O (540 mg, 12.8 mmol) portionwise and stirred for 30 minutes before diluting with 200 mL of water and washing with ether (30 mL×3). The water layer was acidified to pH=4 with diluted HCl and extracted with EtOAc (50 mL×5). The combined organic layer was washed with brine, dried over anhydrous Na2SO4 and concentrated to afford title compound: 1H-NMR (400 MHz, d6-DMSO) δ ppm 12.93 (brs, 1H), 10.22 (s, 1H), 9.25 (d, J=1.2 Hz, 1H), 8.71 (d, J=1.2 Hz, 1H), 3.98 (s, 2H).

1. washwashing with ether (30 mL×3)
2. extractionextracted with EtOAc (50 mL×5)
3. washThe combined organic layer was washed with brine
4. dry with materialdried over anhydrous Na2SO4
5. concentrationconcentrated