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Sodium borohydride → tert-butyl 4-(3-amino-6-((1R,3R,4R)-3-fluoro-4-hydroxycyclohexyl)pyrazin-2-yl)-2-fluorobenzoate

HRID 596021
Notes
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Reaction equation

HRID 596021 reaction equation
[NH2:1][C:2]1[C:3]([C:16]2[CH:28]=[CH:27][C:19]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])=[C:18]([F:29])[CH:17]=2)=[N:4][C:5]([C@@H:8]2[CH2:13][CH2:12][C:11](=[O:14])[C@H:10]([F:15])[CH2:9]2)=[CH:6][N:7]=1.[BH4-].[Na+]>CO>[NH2:1][C:2]1[C:3]([C:16]2[CH:28]=[CH:27][C:19]([C:20]([O:22][C:23]([CH3:26])([CH3:24])[CH3:25])=[O:21])=[C:18]([F:29])[CH:17]=2)=[N:4][C:5]([C@H:8]2[CH2:13][CH2:12][C@H:11]([OH:14])[C@@H:10]([F:15])[CH2:9]2)=[CH:6][N:7]=1.[NH2:1][C:2]1[C:3]([C:16]2[CH:28]=[CH:27][C:19]([C:20]([O:22][C:23]([CH3:26])([CH3:24])[CH3:25])=[O:21])=[C:18]([F:29])[CH:17]=2)=[N:4][C:5]([C@@H:8]2[CH2:13][CH2:12][C@@H:11]([OH:14])[C@H:10]([F:15])[CH2:9]2)=[CH:6][N:7]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 2

HCID 4311764Sodium borohydrideHCID 118049846(+/-)-tert-butyl 4-(3-amino-6-((1R,3R)-3-fluoro-4-oxocyclohexyl)pyrazin-2-yl)-2-fluorobenzoate

Product 2

HCID 118045246tert-butyl 4-(3-amino-6-((1R,3R,4R)-3-fluoro-4-hydroxycyclohexyl)pyrazin-2-yl)-2-fluorobenzoateYield 47%HCID 118045514(+/-)-tert-butyl 4-(3-amino-6-((1S,3S,4S)-3-fluoro-4-hydroxycyclohexyl)pyrazin-2-yl)-2-fluorobenzoate
Yield 43.9%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of (+/−)-tert-butyl 4-(3-amino-6-((1R,3R)-3-fluoro-4-oxocyclohexyl)pyrazin-2-yl)-2-fluorobenzoate (1.9 g, 4.71 mmol) in MeOH (47.1 mL) was added NaBH4 (0.267 g, 7.06 mmol) at 0° C. The reaction mixture was stirred for 2 h. After quenched with sat. NaHCO3 solution, the reaction mixture was extracted with EtOAc. The organic layer was washed with water and brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by flash chromatography eluting with flat 35% of EtOAc in heptane to provide (+/−)-tert-butyl 4-(3-amino-6-((1S,3S,4S)-3-fluoro-4-hydroxycyclohexyl)pyrazin-2-yl)-2-fluorobenzoate (839 mg, 2.07 mmol, 43.9%) and (+/−)-tert-butyl 4-(3-amino-6-((1R,3R,4R)-3-fluoro-4-hydroxycyclohexyl)pyrazin-2-yl)-2-fluorobenzoate (900 mg, 2.22 mmol, 47%). LCMS (m/z): 406.3 (MH+), 0.85 min and 406.3 (MH+), 0.85 min respectively.

Workup

  1. customAfter quenched with sat. NaHCO3 solution
  2. extractionthe reaction mixture was extracted with EtOAc
  3. washThe organic layer was washed with water and brine
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe crude product was purified by flash chromatography
  8. washeluting with flat 35% of EtOAc in heptane

Sources & evidence

ORD record
ord-fa288fce9fa64dae8a97928a674f91b9
Source dataset
uspto-grants-2016_01
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09242996B2

Reaction notes

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