反应详情

A clear, yellow solution of ethyl 8-diazoacetyl-12-acetoxyheptadecanoate (8.4 g., 0.02 mole) in dioxane (50 ml.) is vigorously stirred at 20° and treated with 2N sulfuric acid (30 ml.) added dropwise over 5 minutes. The resulting turbid solution is warmed to and maintained at 65° for 30 minutes. The reaction solution is cooled to 20°, diluted with water to a total volume of one liter and extracted with ether (5 × 200 ml.). The organic extract is washed with water (2 × 200 ml.), 5% aqueous sodium bicarbonate (200 ml.), water (200 ml.), and saturated brine (2 × 200 ml.), dried over sodium sulfate and filtered. Evaporation (in vacuo at 40°-65°) of the filtrate gives the title compound as a deep yellow oil (7.9 g., 96%), pmr (CDCl3) δ0.86 (3H,t), 1.28 (27H,e), 2.0 (3H,s), 2.25 (3H,t), 3.36 (H,b), 4.10 (2H,q), 4.21 (2H,s) and 4.84 (H,b).

1. additionadded dropwise over 5 minutes
2. temperatureThe resulting turbid solution is warmed to and
3. temperaturemaintained at 65° for 30 minutes
4. temperatureThe reaction solution is cooled to 20°
5. extractionextracted with ether (5 × 200 ml.)
6. extractionThe organic extract
7. washis washed with water (2 × 200 ml.), 5% aqueous sodium bicarbonate (200 ml.), water (200 ml.), and saturated brine (2 × 200 ml.)
8. dry with materialdried over sodium sulfate
9. filtrationfiltered
10. customEvaporation (in vacuo at 40°-65°) of the filtrate