[CH2:1]([O:3][CH:4]([O:8][CH2:9][CH3:10])[CH:5]=[N+]=[N-])[CH3:2].C(OC(OCC)CNC(N)=O)C.[OH:23][C@H:24]1[CH2:44][C@@:43]2([CH3:45])[C@@H:35]([CH2:36][C@@H:37]([OH:47])[C@:38]2([OH:46])[C:39](=[O:42])[CH2:40][OH:41])[C@H:34]2[C@H:25]1[C@:26]1([CH3:49])[C:31]([CH2:32][CH2:33]2)=[CH:30][C:29](=[O:48])[CH2:28][CH2:27]1>CCOCC.CCCCC.CO>[CH2:1]([O:3][CH:4]([O:8][CH2:9][CH3:10])[CH2:5][O:47][C@@H:37]1[CH2:36][C@@H:35]2[C@:43]([CH3:45])([CH2:44][C@H:24]([OH:23])[C@H:25]3[C@H:34]2[CH2:33][CH2:32][C:31]2[C@:26]3([CH3:49])[CH2:27][CH2:28][C:29](=[O:48])[CH:30]=2)[C@@:38]1([OH:46])[C:39](=[O:42])[CH2:40][OH:41])[CH3:2]A solution of 2,2-diethoxy-1-diazoethane (prepared from 0.0935 mole of N-2,2-diethoxyethyl urea by the method of W. Kirmse and B. Buschhoff, Chem. Ber., 100, 1491 (1967)) in 300 ml of 3:2 ether pentane is diluted with 100 ml of methanol and cooled to 0°C. 11β,16α,17,21-Tetrahydroxypregn-4-ene-3,20-dione, 16,17-cycloborate is added in portions until nitrogen evolution ceases. The solvent is removed in vacuo and the residue is recrystallized from methanol to yield the title compound.
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