Trifluoroacetic acid → 4-[(1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-[[3-(dimethylamino)propylamino]methyl]-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-1,2,3,4,5,6,7,7a,11,11b,12,13,13a,13b-tetradecahydrocyclopenta[a]chrysen-9-yl]benzoic acid

HRID 405061Notes

Reaction equation

HRID 405061 reaction equation
[CH3:1][N:2]([CH3:50])[CH2:3][CH2:4][CH2:5][NH:6][CH2:7][C@:8]12[CH2:46][CH2:45][C@@H:44]([C:47]([CH3:49])=[CH2:48])[C@@H:9]1[C@@H:10]1[C@@:23]([CH3:26])([CH2:24][CH2:25]2)[C@@:22]2([CH3:27])[C@@H:13]([C@:14]3([CH3:43])[C@@H:19]([CH2:20][CH2:21]2)[C:18]([CH3:29])([CH3:28])[C:17]([C:30]2[CH:42]=[CH:41][C:33]([C:34]([O:36]C(C)(C)C)=[O:35])=[CH:32][CH:31]=2)=[CH:16][CH2:15]3)[CH2:12][CH2:11]1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH3:50][N:2]([CH3:1])[CH2:3][CH2:4][CH2:5][NH:6][CH2:7][C@:8]12[CH2:46][CH2:45][C@@H:44]([C:47]([CH3:49])=[CH2:48])[C@@H:9]1[C@@H:10]1[C@@:23]([CH3:26])([CH2:24][CH2:25]2)[C@@:22]2([CH3:27])[C@@H:13]([C@:14]3([CH3:43])[C@@H:19]([CH2:20][CH2:21]2)[C:18]([CH3:29])([CH3:28])[C:17]([C:30]2[CH:31]=[CH:32][C:33]([C:34]([OH:36])=[O:35])=[CH:41][CH:42]=2)=[CH:16][CH2:15]3)[CH2:12][CH2:11]1

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86676404HCID 86676404, compound

Product 1

HCID 715967194-[(1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-[[3-(dimethylamino)propylamino]methyl]-1-isopropenyl-5a,5b,8,8,11a-pentamethyl-1,2,3,4,5,6,7,7a,11,11b,12,13,13a,13b-tetradecahydrocyclopenta[a]chrysen-9-yl]benzoic acidYield 73.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of tert-butyl 4-((1R,3aS,5aR,5bR,7aR,11aS,11bR,13aR,13bR)-3a-((3-(dimethylamino)propylamino)methyl)-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 (114 mg, 0.167 mmol) in DCM (1 ml) was added TFA (0.4 ml, 5.19 mmol). The mixture was stirred at rt for 5 h and was concentrated under reduced pressure. The residue was purified by prep HPLC. The fractions containing the expected product were combined and concentrated under reduced pressure to afford the title compound as a white solid (77 mg, 0.122 mmol, 73.3% yield). LCMS: m/e 629.6 (M−H)−, 2.22 min (method 6). 1H NMR (500 MHz, Acetic acid) δ ppm 8.03 (d, J=8.24 Hz, 2H) 7.30 (d, J=8.24 Hz, 2H), 5.37 (d, J=4.58 Hz, 1H), 4.79 (s, 1H), 4.68 (s, 1H), 3.32-3.44 (m, 3H), 3.25-3.32 (m, 2H), 2.96 (d, J=13.12 Hz, 1H), 2.89-2.94 (m, 6H), 2.49-2.58 (m, 1H), 2.30-2.38 (m, J=8.09, 7.86, 7.74, 7.74 Hz, 2H), 1.75 (s, 3H), 1.19 (s, 3H), 1.13-2.23 (m, 22H), 1.09 (s, 3H), 1.08 (s, 3H), 1.02 (s, 3H), 1.00 (s, 3H).

Workup

  1. concentrationwas concentrated under reduced pressure
  2. customThe residue was purified by prep HPLC
  3. additionThe fractions containing the expected product
  4. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-1cae31aa6b364cc3a4663ebb4c20ce45
Source dataset
uspto-grants-2014_06
Patent number
US08748415B2

Reaction notes

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