反应详情

温度

75 °C

To a solution of (R)-benzyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-((1S,45)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)ethyl)amino)-5a,5b,8,8,11a-pentamethyl-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)cyclohex-3-enecarboxylate (47.2 mg, 0.048 mmol) in THF (1.5 mL) and MeOH (0.5 mL) was added 1N lithium hydroxide (0.193 mL, 0.193 mmol). The reaction was stirred at 75° C. After 3 h the reaction mixture was concentrated and the crude material was dissolved in THF (2 mL)/H2O (150 μL), purified by reverse phase prep-HPLC using prep-HPLC method 15 and dried under vacuum to give (R)-4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-((1S,4S)-2-oxa-5-azabicyclo[2.2.1]heptan-5-yl)ethyl)amino)-5a,5b,8,8,11a-pentamethyl-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)cyclohex-3-enecarboxylic acid (32.9 mg, 0.036 mmol, 75% yield) as a white solid. LC/MS: m/e 659.5 (M+H)+, 4.14 min (method 8). 1H NMR (400 MHz, 1:1 CDCl3:METHANOL-d4) δ 5.33 (br. s., 1H), 5.22-5.08 (m, 1H), 4.78 (s, 1H), 4.70 (s, 1H), 4.54 (s, 1H), 4.04 (d, J=8.8 Hz, 1H), 3.84 (br. s., 1H), 3.73 (dd, J=8.8, 1.5 Hz, 1H), 3.23-2.96 (m, 5H), 2.88-2.63 (m, 2H), 2.58-2.40 (m, 1H), 2.35-2.09 (m, 5H), 2.08-1.90 (m, 8H), 1.83-1.75 (m, 1H), 1.71 (s, 3H), 1.70-1.61 (m, 2H), 1.61-1.42 (m, 8H), 1.41-1.36 (m, 1H), 1.35 (s, 1H), 1.33-1.23 (m, 1H), 1.10 (s, 3H), 1.05 (s, 3H), 0.95 (s, 3H), 0.93 (s, 3H), 0.88 (s, 3H)

1. concentrationAfter 3 h the reaction mixture was concentrated
2. dissolutionthe crude material was dissolved in THF (2 mL)/H2O (150 μL)
3. custompurified by reverse phase prep-HPLC using prep-HPLC method 15
4. customdried under vacuum