Trifluoroacetic acid → Trifluoroacetic acid

HRID 85611Notes

Reaction equation

[F:1][C:2]1[CH:7]=[C:6]([CH2:8][NH:9][C@:10]23[CH2:45][CH2:44][C@@H:43]([C:46]([CH3:48])=[CH2:47])[C@@H:11]2[C@@H:12]2[C@@:25]([CH3:28])([CH2:26][CH2:27]3)[C@@:24]3([CH3:29])[C@@H:15]([C@:16]4([CH3:42])[C@@H:21]([CH2:22][CH2:23]3)[C:20]([CH3:31])([CH3:30])[C:19]([C:32]3[CH:41]=[CH:40][C:35]([C:36]([O:38]C)=[O:37])=[CH:34][CH:33]=3)=[CH:18][CH2:17]4)[CH2:14][CH2:13]2)[CH:5]=[CH:4][N:3]=1.[C:49]([OH:55])([C:51]([F:54])([F:53])[F:52])=[O:50].O[Li].O>C1COCC1>[F:1][C:2]1[CH:7]=[C:6]([CH2:8][NH:9][C@:10]23[CH2:45][CH2:44][C@@H:43]([C:46]([CH3:48])=[CH2:47])[C@@H:11]2[C@@H:12]2[C@@:25]([CH3:28])([CH2:26][CH2:27]3)[C@@:24]3([CH3:29])[C@@H:15]([C@:16]4([CH3:42])[C@@H:21]([CH2:22][CH2:23]3)[C:20]([CH3:31])([CH3:30])[C:19]([C:32]3[CH:41]=[CH:40][C:35]([C:36]([OH:38])=[O:37])=[CH:34][CH:33]=3)=[CH:18][CH2:17]4)[CH2:14][CH2:13]2)[CH:5]=[CH:4][N:3]=1.[C:49]([OH:55])([C:51]([F:54])([F:53])[F:52])=[O:50]

Participants

Conditions

Temperature: 75 °C

Procedure

To a solution of methyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-fluoropyridin-4-yl)methylamino)-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)benzoate, TFA (77.7 mg, 0.101 mmol) in THF (3 mL) was added a 0.753 molar aqueous solution of LiOH.H2O (0.539 mL, 0.405 mmol). The reaction mixture was heated to 75° C. After 4 h, the reaction mixture was concentrated. The crude residue was dissolved in THF (1.5 mL) and MeOH (200 μL), filtered and purified by reverse phase preparative HPLC using HPLC method 3 to give 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((2-fluoropyridin-4-yl)methylamino)-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)benzoic acid, TFA (30.6 mg, 0.037 mmol, 36.1% yield) as a white solid. LCMS: m/e 637.7 (M−H)−, 3.12 min (method 6). 1H NMR (500 MHz, 1:1 CDCl3:MeOD) δ=8.24 (d, J=5.2 Hz, 1H), 7.92 (d, J=8.2 Hz, 2H), 7.43 (d, J=5.2 Hz, 1H), 7.24 (s, 1H), 7.20 (d, J=8.5 Hz, 2H), 5.29 (dd, J=1.7, 6.3 Hz, 1H), 4.78 (s, 1H), 4.17 (br. s., 2H), 2.78-2.69 (m, 1H), 2.18-2.10 (m, 2H), 2.09-2.01 (m, 2H), 1.98 (dd, J=3.1, 11.9 Hz, 1H), 1.96-1.88 (m, 1H), 1.83-1.76 (m, 1H), 1.72 (s, 3H), 1.70-1.64 (m, 1H), 1.63-1.40 (m, 10H), 1.39-1.31 (m, 1H), 1.31-1.23 (m, 2H), 1.13 (s, 3H), 1.07 (s, 3H), 1.02 (s, 3H), 0.95 (s, 3H), 0.94 (s, 3H). 13C NMR (1:1 CDCl3:MeOD) d ppm 15.3, 16.6, 17.4, 19.5, 20.6, 21.8, 22.2, 26.1, 27.6, 29.0, 29.5, 30.2, 33.9, 34.6, 37.2, 38.2, 38.4, 41.8, 42.8, 43.1, 45.7, 47.2, 49.7, 49.9, 50.3, 50.5, 53.9, 78.8, 123.1, 123.2, 124.9, 129.3, 129.7, 131.0, 147.4, 149.7, 164.0, 166.0, 170.1.

Workup

concentrationthe reaction mixture was concentrated
dissolutionThe crude residue was dissolved in THF (1.5 mL)
filtrationMeOH (200 μL), filtered
custompurified by reverse phase preparative HPLC

Sources & evidence

ORD record: ord-09171b72b3554738bf5b0a7ea46aac0b
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08846647B2

Reaction notes

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