Sodium Carbonate → tert-Butyl 4-(4-(6-aMino-5-(1-(2,6-dichloro-3-fluorophenyl)ethoxy)pyridin-3-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate, (R)-

HRID 2206885Notes

Reaction equation

HRID 2206885 reaction equation
[Cl:1][C:2]1[C:7]([F:8])=[CH:6][CH:5]=[C:4]([Cl:9])[C:3]=1[C@H:10]([O:12][C:13]1[C:14]([NH2:28])=[N:15][CH:16]=[C:17](B2OC(C)(C)C(C)(C)O2)[CH:18]=1)[CH3:11].[C:29]([O:33][C:34]([N:36]1[CH2:41][CH2:40][CH:39]([N:42]2[CH:46]=[C:45](Br)[CH:44]=[N:43]2)[CH2:38][CH2:37]1)=[O:35])([CH3:32])([CH3:31])[CH3:30].C([O-])([O-])=O.[Na+].[Na+]>COCCOC.O>[C:29]([O:33][C:34]([N:36]1[CH2:37][CH2:38][CH:39]([N:42]2[CH:46]=[C:45]([C:17]3[CH:16]=[N:15][C:14]([NH2:28])=[C:13]([O:12][C@@H:10]([C:3]4[C:4]([Cl:9])=[CH:5][CH:6]=[C:7]([F:8])[C:2]=4[Cl:1])[CH3:11])[CH:18]=3)[CH:44]=[N:43]2)[CH2:40][CH2:41]1)=[O:35])([CH3:32])([CH3:30])[CH3:31]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 45480278tert-Butyl 4-(4-bromo-1H-pyrazol-1-yl)piperidine-1-carboxylateHCID 59599412(R)-3-(1-(2,6-Dichloro-3-fluorophenyl)ethoxy)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine

Product 1

HCID 49765979tert-Butyl 4-(4-(6-aMino-5-(1-(2,6-dichloro-3-fluorophenyl)ethoxy)pyridin-3-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate, (R)-Yield 65%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
87 °C

Procedure

To a stirred solution of 3-[(R)-1-(2,6-dichloro-3-fluoro-phenyl)-ethoxy]-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyridin-2-ylamine (4.2711 g, 10.0 mmol) and 4-(4-bromo-pyrazol-1-yl)-piperidine-1-carboxylic acid tert-butyl ester (3.9628 g, 12.0 mmol) in DME (40 mL) was added a solution of Na2CO3 (3.1787 g, 30.0 mmol) in water (10 mL). The solution was degassed and charged with nitrogen three times. To the solution was added Pd(PPh3J2CI2 (351 mg, 0.50 mmol). The reaction solution was degassed and charged with nitrogen again three times. The reaction solution was stirred at 87° C. oil bath for about 16 hours (or until consumption of the borane pinacol ester), cooled to ambient temperature and diluted with EtOAc (200 mL). The reaction mixture was filtered through a pad of celite and washed with EtOAc. The EtOAc solution was washed with brine, dried over Na2SO4, and concentrated. The crude product was purified on a silica gel column eluting with EtOAc/hexane system (0% EtOAc to 100% EtOAc) to afford 4-(4-{6-amino-5-[(R)-1-(2,6-dichloro-3-fluoro-phenyl)-ethoxy]-pyridin-3-yl}-pyrazol-1-yl)-piperidine-1-carboxylic acid tert-butyl ester (3.4167 g, 65% yield, −95% purity) with a Rf of 0.15 (50% EtOAc/Hexanes). MS m/e 550 (M+1)+.

Workup

  1. customThe solution was degassed
  2. additioncharged with nitrogen three times
  3. additionTo the solution was added Pd(PPh3J2CI2 (351 mg, 0.50 mmol)
  4. customThe reaction solution was degassed
  5. additioncharged with nitrogen again three times
  6. customuntil consumption of the borane pinacol ester),
  7. temperaturecooled to ambient temperature
  8. additiondiluted with EtOAc (200 mL)
  9. filtrationThe reaction mixture was filtered through a pad of celite
  10. washwashed with EtOAc
  11. washThe EtOAc solution was washed with brine
  12. dry with materialdried over Na2SO4
  13. concentrationconcentrated
  14. customThe crude product was purified on a silica gel column
  15. washeluting with EtOAc/hexane system (0% EtOAc to 100% EtOAc)

Sources & evidence

ORD record
ord-19c888c78d10456d88de4832b47578bc
Source dataset
uspto-grants-2016_06
Patent number
US09375425B2

Reaction notes

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