Reaction Steps
To a solution of 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-5a,5b,8,8,11a-pentamethyl-3a-((2-((1S,4S)-5-(methylsulfonyl)-2,5-diazabicyclo[2.2.1]heptan-2-yl)ethyl)amino)-1-(prop-1-en-2-yl)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)benzoic acid, 2 TFA (10 mg, 10.42 μmol) in a mixture of THF (1.5 mL) and MeOH (0.5 mL) was added palladium hydroxide on carbon (14.63 mg, 0.021 mmol). The resulting slurry was purged with H2 (g) and stirred under a H2 (g) atmosphere for 16 h. The mixture was treated with celite (15 mg), filtered, washed with THF and concentrated. A grey residue was dissolved in THF (1 mL) and MeOH (0.5 mL), purified by reverse phase prep-HPLC using HPLC methods 6 and dried under vacuum to give 4-((1S,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-1-isopropyl-5a,5b,8,8,11a-pentamethyl-3a-((2-((1S,4S)-5-(methylsulfonyl)-2,5-diazabicyclo[2.2.1]heptan-2-yl)ethyl)amino)-2,3,3a,4,5,5a,5b,6,7,7a,8,11,11a,11b,12,13,13a,13b-octadecahydro-1H-cyclopenta[a]chrysen-9-yl)benzoic acid, 2 TFA (6.2 mg, 60.6% yield) as white solid. LC/MS: m/e 734.6 (M+H)+, 2.25 min (method 3). 1H NMR (400 MHz, 1:1 CDCl3:METHANOL-d4) δ 7.91 (d, J=8.3 Hz, 2H), 7.19 (d, J=8.3 Hz, 2H), 5.29 (d, J=4.6 Hz, 1H), 4.35 (s, 1H), 3.82 (s, 1H), 3.61 (d, J=10.3 Hz, 1H), 3.28 (d, J=1.7 Hz, 1H), 3.15 (d, J=11.7 Hz, 1H), 3.10-3.00 (m, 3H), 2.92 (s, 3H), 2.82 (d, J=10.0 Hz, 1H), 2.14 (dd, J=17.1, 6.4 Hz, 1H), 2.09-2.03 (m, 1H), 2.02-1.86 (m, 5H), 1.85-1.64 (m, 7H), 1.57 (dd, J=17.4, 11.7 Hz, 5H), 1.51-1.40 (m, 4H), 1.39-1.21 (m, 4H), 1.15 (s, 3H), 1.07 (s, 3H), 1.02 (s, 3H), 0.94 (s, 3H), 0.93 (s, 3H), 0.90 (d, J=6.8 Hz, 3H), 0.81 (d, J=6.6 Hz, 3H).
