I(O)(O)(O)(O)(O)=[O:2].[OH:8][C@@H:9]1[C@H:25]2[C@@H:16]([CH2:17][CH2:18][C:19]3[C@:24]2([CH3:26])[CH2:23][CH2:22][C:21](=[O:27])[CH:20]=3)[C@H:15]2[C@@:11]([CH3:33])([C@@:12]([OH:32])([C:28](=[O:31])CO)[CH2:13][CH2:14]2)[CH2:10]1>O.C1COCC1.[OH-].[Na+]>[OH:8][C@@H:9]1[C@H:25]2[C@@H:16]([CH2:17][CH2:18][C:19]3[C@:24]2([CH3:26])[CH2:23][CH2:22][C:21](=[O:27])[CH:20]=3)[C@H:15]2[C@@:11]([CH3:33])([C@@:12]([OH:32])([C:28]([OH:2])=[O:31])[CH2:13][CH2:14]2)[CH2:10]1A solution of orthoperiodic acid (21.4 g, 94 mmol) in water (80 ml) was added to a solution of (8S,9S,10R,11S,13S,14S,17R)-11,17-dihydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3(2H)-one (Hydrocortisone, 17.0 g, 46.9 mmol) in THF (350 ml), and the reaction mixture was stirred at room temperature in an open flask for 2 hours. Then the mixture was poured onto ice. After the ice had molten, the mixture was extracted with ethyl acetate (3 times 150 ml). Evaporation of the solvent gave a white solid, which was dissolved in aqueous NaOH (1 M, 150 ml). The solution was washed with ethyl acetate, and acidified with conc. aqueous HCl. The precipitate formed was collected by filtration, and dried on the sinter overnight to afford the target compound as an off-white powder (15.51 g, 95%).
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