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)-4-methylpentanoate (Example 41, 0.190 g, 0.253 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 volatiles were evaporated and the reaction mixture was acidified with 1N HCl, extracted with EtOAc, dried over Na2SO4 then the organic layer was concentrated and dried under vacuum to afford the title compound as an off white solid. Wt: 0.100 g: Yield: 56.7%; 1H NMR (300 MHz, DMSO-d6): δ 7.69 (d, 1H, J=8.1 Hz), 7.54 (d, 1H, J=6.6 Hz), 4.62 (s, 1H), 4.51 (s, 1H), 4.29-4.18 (m, 2H), 3.95-3.84 (m, 1H), 3.01-2.88 (m, 2H), 2.34-2.18 (m, 3H), 1.91-1.72 (m, 3H), 1.69-1.10 (m, 31H), 0.96-0.58 (m, 23H); Mass: [M+1]+694 (10%), [M+Na]+ 717 (100%); IR (KBr, cm−1): 3454, 2950, 1726, 1634, 1523, 1466, 1369, 1266, 1207, 1195, 1157, 1044, 1009, 922, 882, 722; M.R: 192.4° C.-213.8° C.; HPLC: 95.97%.
