Hydrochloric Acid → Cobimetinib (R-enantiomer)

HRID 605733Notes

Reaction equation

HRID 605733 reaction equation
[F:1][C:2]1[C:3]([NH:29][C:30]2[CH:35]=[CH:34][C:33]([I:36])=[CH:32][C:31]=2[F:37])=[C:4]([C:9]([N:11]2[CH2:14][C:13]([C@H:16]3[CH2:21][CH2:20][CH2:19][CH2:18][N:17]3C(OC(C)(C)C)=O)([OH:15])[CH2:12]2)=[O:10])[CH:5]=[CH:6][C:7]=1[F:8].CO.Cl>O1CCOCC1>[F:1][C:2]1[C:3]([NH:29][C:30]2[CH:35]=[CH:34][C:33]([I:36])=[CH:32][C:31]=2[F:37])=[C:4]([C:9]([N:11]2[CH2:14][C:13]([C@H:16]3[CH2:21][CH2:20][CH2:19][CH2:18][NH:17]3)([OH:15])[CH2:12]2)=[O:10])[CH:5]=[CH:6][C:7]=1[F:8]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 887MethanolHCID 670516811-Piperidinecarboxylic acid, 2-[1-[3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]benzoyl]-3-hydroxy-3-azetidinyl]-, 1,1-dimethylethyl ester, (2R)-

Product 1

HCID 16222097Cobimetinib (R-enantiomer)Yield 89.9%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

1,1-dimethylethyl(2R)-2-[1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-hydroxyazetidin-3-yl]piperidine-1-carboxylate (74.9 mg, 0.12 mmol) was taken into methanol (1 mL) followed by addition of 4 N HCl in dioxane (1 mL) and the solution was stirred at room temperature for one hour. The solution was then concentrated and the residue partitioned with chloroform and saturated aqueous sodium bicarbonate. The organic layer was washed with brine, dried over anhydrous sodium sulfate then filtered and concentrated. Purification of the residue by silica gel flash chromatography using ethyl acetate then concentrated aqueous ammonia in chloroform and methanol (0.1:10:1) as eluents afforded 1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-[(2R)-piperidin-2-yl]azetidin-3-ol (57.3 mg) as a colorless amorphous solid. The free base was taken into methanol (1 mL) then brought to about pH 1 by addition of 4 N HCl in dioxane and the solution concentrated. The residue was triturated with ethyl ether to afford a suspension. The solid was collected by filtration to afford 1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)-3-[(2R)-piperidin-2-yl]azetidin-3-ol hydrochloride salt (49 mg, 72% yield) as a colorless solid. 1H NMR (400 MHz, CDCl3): 8.43-8.39 (d, 1H), 7.41-7.38 (dd, 1H), 7.33-7.31 (dt, 1H), 7.14-7.10 (m, 1H), 6.84-6.80 (m, 1H), 6.63-6.57 (m, 1H), 4.12-3.99 (m, 4H), 3.10-3.08 (d, 1H), 2.72-2.69 (d, 1H), 2.64-2.62 (m, 1H), 1.61-1.58 (m, 2H), 1.36-1.16 (m, 4H); MS (EI) for C21H21F3IN3O2: 532 (MH+).

Workup

  1. concentrationThe solution was then concentrated
  2. customthe residue partitioned with chloroform and saturated aqueous sodium bicarbonate
  3. washThe organic layer was washed with brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationthen filtered
  6. concentrationconcentrated
  7. customPurification of the residue by silica gel flash chromatography

Sources & evidence

ORD record
ord-006f9fcd30c848058c6e8ddd0c7f2d14
Source dataset
uspto-grants-2011_03
Patent number
US07915250B2

Reaction notes

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