Sodium Thiosulfate → Tert-butyl 4-(2-amino-5-bromopyridin-3-yl)-2-fluorobenzoate

HRID 596076Notes

Reaction equation

HRID 596076 reaction equation
[NH2:1][C:2]1[C:7]([C:8]2[CH:20]=[CH:19][C:11]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])=[C:10]([F:21])[CH:9]=2)=[CH:6][CH:5]=[CH:4][N:3]=1.C1C(=O)N([Br:29])C(=O)C1.C([O-])(O)=O.[Na+].[O-]S([O-])(=S)=O.[Na+].[Na+]>C(#N)C.C(OCC)(=O)C>[NH2:1][C:2]1[C:7]([C:8]2[CH:20]=[CH:19][C:11]([C:12]([O:14][C:15]([CH3:17])([CH3:18])[CH3:16])=[O:13])=[C:10]([F:21])[CH:9]=2)=[CH:6][C:5]([Br:29])=[CH:4][N:3]=1

Participants

7

Reactant 4

HCID 24477Sodium ThiosulfateHCID 67184N-bromobutanimideHCID 516892Sodium BicarbonateHCID 118045884Tert-butyl 4-(2-aminopyridin-3-yl)-2-fluorobenzoate

Product 1

HCID 118046192Tert-butyl 4-(2-amino-5-bromopyridin-3-yl)-2-fluorobenzoateYield 90%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

A solution of tert-butyl 4-(2-aminopyridin-3-yl)-2-fluorobenzoate (700 mg, 2.43 mmol) in acetonitrile (10 mL) was treated with NBS (453 mg, 2.55 mmol). After 10 min, the reaction was completed. The reaction was treated with 1:1 sat. aq. NaHCO3: sat.aq. Na2S2O3 (10 mL). The mixture was stirred vigorously for 10 min. The mixture was diluted with ethyl acetate (30 mL) and the layers were separated. The organics were washed with brine, dried over magnesium sulfate, filtered and concentrated to provide tert-butyl 4-(2-amino-5-bromopyridin-3-yl)-2-fluorobenzoate (803 mg, 90% yield). LCMS (m/z): 367.2, 369.2 (MH+), 0.75 min.

Workup

  1. customthe layers were separated
  2. washThe organics were washed with brine
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-e66cffe4a97b474d855455a16bed46c4
Source dataset
uspto-grants-2016_01
Patent number
US09242996B2

Reaction notes

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