反应详情

To a solution of (2H-tetrazol-5-yl)-acetic acid ethyl ester (2.0 g, 13 mmol) in dimethylformamide (5 mL) was added 2-iodo-propane (11 g, 64 mmol) and sodium hydroxide (2.6 g, 64 mmol) and the solution was stirred at room temperature for 2 h. Ice water was added and the solution was extracted several times with ethyl acetate. The combined organic layers were washed with a saturated aqueous solution of sodium chloride, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was purified via silica gel column chromatography to provide a mixture of (2-isopropyl-2H-tetrazol-5-yl)-acetic acid ethyl ester and (1-isopropyl-1H-tetrazol-5-yl)-acetic acid ethyl ester (2 g, 79% yield).

1. extractionthe solution was extracted several times with ethyl acetate
2. washThe combined organic layers were washed with a saturated aqueous solution of sodium chloride
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified via silica gel column chromatography
7. customto provide