Hydrochloric Acid → Baricitinib

HRID 1692978Notes

Reaction equation

HRID 1692978 reaction equation
C(OC[N:9]1[C:13]2[N:14]=[CH:15][N:16]=[C:17]([C:18]3[CH:19]=[N:20][N:21]([C:23]4([CH2:32][C:33]#[N:34])[CH2:26][N:25]([S:27]([CH2:30][CH3:31])(=[O:29])=[O:28])[CH2:24]4)[CH:22]=3)[C:12]=2[CH:11]=[CH:10]1)(=O)C(C)(C)C.O.[OH-].[Li+].Cl>C(#N)C.C(O)(C)C>[N:14]1[C:13]2[NH:9][CH:10]=[CH:11][C:12]=2[C:17]([C:18]2[CH:19]=[N:20][N:21]([C:23]3([CH2:32][C:33]#[N:34])[CH2:24][N:25]([S:27]([CH2:30][CH3:31])(=[O:28])=[O:29])[CH2:26]3)[CH:22]=2)=[N:16][CH:15]=1

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 66824167(4-(1-(3-(Cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1H-pyrazol-4-yl)-7H-pyrrolo(2,3-d)pyrimidin-7-yl)methyl pivalate

Product 1

HCID 44205240BaricitinibYield 78.4%

Reagents, catalysts & solvents 2

HCID 3776IsopropanolSolventHCID 6342AcetonitrileSolvent

Conditions

Temperature
47.5 °C

Procedure

Alternatively, a suspension of (4-(1-(3-(cyanomethyl)-1-(ethylsulfonyl)azetidin-3-yl)-1H-pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)methyl pivalate (20, 10.0 g, 20.6 mmol) and lithium hydroxide monohydrate (2.59 g, 61.8 mmol) in acetonitrile (CH3CN 40 mL) and isopropyl alcohol (10 mL) was heated at 45-50° C. for 6 hours. When HPLC showed that the reaction was deemed complete, the reaction mixture was cooled to room temperature and 1M hydrochloric acid aqueous solution (41 mL) as added to adjust the pH to 6-7 at temperature below 25° C. After the acid addition, the mixture was stirred at room temperature for 1 h and the precipitates were isolated by filtration. The wet cake was washed with water (50 mL) and dried in vacuum oven at 50° C. to give crude 2-(3-(4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)-1-(ethylsulfonyl)azetidin-3-yl)acetonitrile (14, 6.0 g, 7.65 g theoretical, 78% yield) as off-white solids, which was found to be identical to the material prepared by Method A.

Workup

  1. temperaturethe reaction mixture was cooled to room temperature
  2. customat temperature below 25° C
  3. additionAfter the acid addition
  4. customthe precipitates were isolated by filtration
  5. washThe wet cake was washed with water (50 mL)
  6. customdried in vacuum oven at 50° C.

Sources & evidence

ORD record
ord-0496026cee3b477cba0e2bc7c3a73dce
Source dataset
uspto-grants-2012_04
Patent number
US08158616B2

Reaction notes

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