反应详情

Compound 234a (800 mg, 1 eq.), CeCl3.7H2O (965 mg, 1.5 eq.), and NaI (258 mg, 1 eq.) in ACN (10 mL) were stirred at 85° C. for 1 hr under microwave irradiation. Water was added and the mixture was acidified with 1N HCl to pH 5. The reaction mixture was extracted with diethyl ether. The organic layer was dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude material was purified by chromatography on silica gel (MeOH/DCM) to give compound 236a as a beige solid in 96% yield. 1H NMR (DMSO-d6, 400 MHz) δ (ppm) 4.02 (s, 3H), 7.07 (s, 1H), 7.43 (s, 1H), 7.51 (d, J=9.11 Hz, 1H), 8.11 (d, J=9.11 Hz, 1H), 8.88 (s, 1H); MS (ESI, EI+) m/z=343.9 (MH+).

1. extractionThe reaction mixture was extracted with diethyl ether
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe crude material was purified by chromatography on silica gel (MeOH/DCM)