Reaction Steps
To a stirred solution of (S)-methyl 2-((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)-3-methylbutanoate (Example 39, 0.300 g, 0.407 mmol) in MeOH:THF (2:1) (7.5 ml) 2N NaOH (2.5 ml) was added at 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 and 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: 0.180 g: Yield: 64.9%; 1H NMR (300 MHz, DMSO-d6): δ 7.55 (d, 2H, J=6.6 Hz), 4.62 (s, 1H), 4.51 (s, 1H), 4.20-4.11 (m, 1H), 3.91-3.82 (m, 1H), 3.00-2.98 (m, 2H), 2.71-2.56 (m, 1H), 2.48-2.39 (m, 1H), 2.37-2.18 (m, 2H), 1.92-1.76 (m, 2H), 1.69-1.15 (m, 32H), 0.93-0.76 (m, 15H), 0.85 (s, 3H), 0.84 (s, 3H); Mass: [M+Na]+ 703 (100); IR (KBr, cm−1): 3321, 2951, 1713, 1631, 1532, 1460, 1386, 1252, 1169, 1108, 1044, 983, 882; M.R: 203.9° C.-205.0° C.; HPLC: 97.3%.
