反应详情

The product of Step 1 (18.3 g, 67.8 mmol) was added to a suspension of potassium tert-butoxide (33.55 g, 299.0 mmol) in dry diethyl ether (500 mL) at 0° C., treated with H2O (1.35 mL, 75.0 mmol), and was vigorously stirred overnight at room temperature. The reaction mixture was poured in a mixture of ice and water and washed with diethyl ether (3×). The aqueous layer was adjusted to acidic pH with a 10% aqueous citric acid solution at 0° C. and extracted with ethyl acetate (3×). The combined organic layers were washed with water (2×), brine, dried (MgSO4), filtered, and concentrated in vacuo to provide the desired product as a pale yellow oil (10 g, 46.8 mmol, 69% yield).

1. washwashed with diethyl ether (3×)
2. customwas adjusted to acidic pH with a 10% aqueous citric acid solution at 0° C.
3. extractionextracted with ethyl acetate (3×)
4. washThe combined organic layers were washed with water (2×), brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo