反应详情

Combine 6-methoxy-10-(4-methoxy-phenyl)-1,2,3,4,4a,9,10,10a-octahydro-phenanthren-9-carboxylic acid methyl ester (1.03 g, 2.71 mmol), Methanol (20.0 mL), tetrahydrofuran (2 mL), and lithium hydroxide aqueous (5 mL), stir at reflux. After 18 hours, add 5N HCl until reaction is acidic, then extract with ethyl acetate and wash with brine. Dry the organic phase with anhydrous sodium sulfate then concentrate to yield the titled compound (0.97 g, 97%) as a white solid. TLC Rf=0.41 in 3% methanol in DCM. 1H NMR (DMSO): 12.30 (s, 1H), 7.25 (m, 3H), 6.92 (m, 3H), 6.82 (dd, 1H, J=8.6, 2.4 Hz), 4.18 (d, 1H, J=12.3 Hz), 3.76 (m, 6H), 3.42 (dd, 1H, J=12.6, 2.4 Hz), 3.27 (s, 1H), 2.50 (m, 1H), 1.89 (m, 1H), 1.59 (m, 2H), 1.40 (m, 1H), 1.23 (m, 1H), 0.99 (m, 3H); MS m/z 322 (M−44, decarbonylation).

1. temperatureat reflux
2. customuntil reaction
3. extractionextract with ethyl acetate
4. washwash with brine
5. dry with materialDry the organic phase with anhydrous sodium sulfate
6. concentrationthen concentrate