Reaction Steps
To a stirred solution of methyl 3-((1S,3R)-3-((1R,3aS,5aR,5bR,7aR,9S,11aR,11bR,13aR,13bR)-9-acetoxy-5a,5b,8,8,11a-pentamethyl-1-(prop-1-en-2-yl)icosahydro-1H-cyclopenta[a]chrysene-3a-carboxamido)-2,2-dimethylcyclobutanecarboxamido)propanoate (Example 37, 0.150 g, 0.211 mmol) in MeOH:THF (2:1) (7.5 ml), 2N NaOH (2.5 ml) was added at about 0° C. and allowed to stir at room temperature for about 16 hours. After completion of the reaction (monitored by TLC), the volatile was evaporated. The reaction mixture was acidified with 1N HCl, filtered, washed with water and dried under vacuum to afford the title compound as an off white solid. Wt: 0.030 g: Yield: 21.7%; 1H NMR (300 MHz, DMSO-d6): δ 7.61 (brm, 1H), 7.54 (d, 1H, J=7.2 Hz), 4.63 (s, 1H), 4.52 (s, 1H), 2.90-2.80 (m, 1H), 3.20-3.08 (m, 3H), 3.00-2.89 (m, 3H), 2.68-2.54 (m, 2H), 2.40-2.18 (m, 5H), 1.90-1.74 (m, 2H), 1.70-1.00 (m, 28H), 0.90, 0.86, 0.84, 0.75, 0.72, 0.64 (s, 15H); Mass: [M+1]+ 653 (2%), [M+Na]+ 675 (100%); IR (KBr, cm−1): 3408, 2947, 2868, 1724, 1652, 1636, 1523, 1376, 1250, 1194, 1108, 1074, 1033, 983, 881, 730; M.R: 188.6° C.-200.1° C.; HPLC: 99.35%.
