反应详情

A solution of 51 (410 mg, 1.23 mmol) in acetic acid (20 mL), water (20 ml), and concetrated HCl (5 mL) was heated in an oil bath (60° C.) overnight. The solvent was removed in vacuo and the residue dissolved in dichloromethane and sodium bicarbonate solution. The aqueous layer was extracted with two additional portions of dichloromethane and the combined organic extracts were washed with brine, dried over Na2SO4, and concentrated under reduced pressure. PCTLC (SiO2, 4 mm, 10% EtOH-90% CHCl3) afforded the title compound (52)

1. customThe solvent was removed in vacuo
2. dissolutionthe residue dissolved in dichloromethane
3. extractionThe aqueous layer was extracted with two additional portions of dichloromethane
4. washthe combined organic extracts were washed with brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated under reduced pressure