Potassium Phosphate, Tribasic → [2-(2-Chloro-6-fluorophenyl)-2H-pyrazolo[4,3-c]pyridin-4-yl]-carbamic acid tert-butyl ester

HRID 626680Notes

Reaction equation

HRID 626680 reaction equation
Br[C:2]1[C:7]2=[CH:8][N:9]([C:11]3[C:16]([F:17])=[CH:15][CH:14]=[CH:13][C:12]=3[Cl:18])[N:10]=[C:6]2[CH:5]=[CH:4][N:3]=1.[C:19](=[O:26])([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])[NH2:20].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2.[O-]P([O-])([O-])=O.[K+].[K+].[K+]>C1(C)C=CC=CC=1.O.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[C:22]([O:21][C:19](=[O:26])[NH:20][C:2]1[C:7]2=[CH:8][N:9]([C:11]3[C:16]([F:17])=[CH:15][CH:14]=[CH:13][C:12]=3[Cl:18])[N:10]=[C:6]2[CH:5]=[CH:4][N:3]=1)([CH3:25])([CH3:24])[CH3:23]

Participants

8

Reactant 4

HCID 62657Potassium Phosphate, TribasicHCID 77922tert-Butyl carbamateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 866970444-Bromo-2-(2-chloro-6-fluorophenyl)-2H-pyrazolo[4,3-c]pyridine

Product 1

HCID 69671929[2-(2-Chloro-6-fluorophenyl)-2H-pyrazolo[4,3-c]pyridin-4-yl]-carbamic acid tert-butyl esterYield 74%

Reagents, catalysts & solvents 3

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
60 °C

Procedure

A mixture of 4-bromo-2-(2-chloro-6-fluorophenyl)-2H-pyrazolo[4,3-c]pyridine (166 mg, 0.51 mmol), tert-butyl carbamate (297 mg, 2.54 mmol), Pd2(dba)3 (23 mg, 0.025 mmol), Xantphos (29 mg, 0.05 mmol) and potassium phosphate tribasic (216 mg, 1.02 mmol) in toluene (5 mL) and water (1 mL) was degassed with argon then heated at 60° C. for 1.5 hours. The reaction mixture was cooled to room temperature and then filtered through Celite® washing with ethyl acetate. The filtrate was washed with water and brine, dried over magnesium sulfate and concentrated under reduced pressure. The resultant residue was purified by silica gel flash chromatography (0-35% ethyl acetate in cyclohexane) to afford the title compound as a yellow solid (137 mg, 74% yield). LCMS (Method C): RT=2.30 min, m/z: 348 [M−C4H7+].

Workup

  1. customwas degassed with argon
  2. temperatureThe reaction mixture was cooled to room temperature
  3. filtrationfiltered through Celite®
  4. washwashing with ethyl acetate
  5. washThe filtrate was washed with water and brine
  6. dry with materialdried over magnesium sulfate
  7. concentrationconcentrated under reduced pressure
  8. customThe resultant residue was purified by silica gel flash chromatography (0-35% ethyl acetate in cyclohexane)

Sources & evidence

ORD record
ord-19ab2b9e799c44e69d55adf4582d5844
Source dataset
uspto-grants-2016_04
Patent number
US09309240B2

Reaction notes

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