C(=O)(O)O.[NH2:5][NH:6][C:7]([NH2:9])=[NH:8].Cl.[OH:11][C@H:12]1[CH2:33][CH2:32][C@@:31]2([CH3:34])[C@H:14]([CH2:15][CH2:16][C@@H:17]3[C@@H:30]2[CH2:29][CH2:28][C@@:27]2([CH3:35])[C@:18]3([OH:36])[CH2:19][CH2:20][C@@H:21]2/[CH:22]=[C:23](\[CH3:26])/[CH:24]=O)[CH2:13]1>O.O1CCOCC1>[NH:6](/[N:5]=[CH:24]/[C:23](/[CH3:26])=[CH:22]/[C@H:21]1[CH2:20][CH2:19][C@:18]2([OH:36])[C@H:17]3[C@H:30]([CH2:29][CH2:28][C@:27]12[CH3:35])[C@:31]1([CH3:34])[C@@H:14]([CH2:13][C@@H:12]([OH:11])[CH2:33][CH2:32]1)[CH2:15][CH2:16]3)[C:7]([NH2:9])=[NH:8]A mixture of 0.50 g of aminoguanidine hydrogencarbonate in 10 ml of water and 30 ml of dioxane was made acid to pH 3 with 3N HCl. A solution of 0.95 g of (E)-3β,14β-dihydroxy-21-methyl-5β-pregn-20-ene-21-carboxaldehyde (Prepn. 1) in 10 ml of dioxane was added at room temperature. After 3 days the mixture was evaporated to dryness under reduced pressure. The crude product was purified by flash chromatography (SiO2) using chloroform/methanol/28% ammonium hydroxide 80/20/3 as the eluant: the fractions containing the title compound were collected and evaporated to dryness. The residue was ground with diethyl ether and ethanol to give 0.75 g of the title compound (I-aa) as a white solid.
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