Water → tert-Butyl 4-(3-fluoro-5-(5-(trifluoromethyl)pyridin-2-yloxy)benzylidene)piperidine-1-carboxylate

HRID 1666472Notes

Reaction equation

HRID 1666472 reaction equation
Br[CH:2]=[C:3]1[CH2:8][CH2:7][N:6]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:5][CH2:4]1.[F:16][C:17]1[CH:18]=[C:19](B(O)O)[CH:20]=[C:21]([O:23][C:24]2[CH:29]=[CH:28][C:27]([C:30]([F:33])([F:32])[F:31])=[CH:26][N:25]=2)[CH:22]=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+].O>C1COCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[F:16][C:17]1[CH:18]=[C:19]([CH:20]=[C:21]([O:23][C:24]2[CH:29]=[CH:28][C:27]([C:30]([F:33])([F:31])[F:32])=[CH:26][N:25]=2)[CH:22]=1)[CH:2]=[C:3]1[CH2:8][CH2:7][N:6]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:5][CH2:4]1

Participants

7

Reactant 4

HCID 962WaterHCID 62657Potassium Phosphate, TribasicHCID 45489892tert-Butyl 4-(bromomethylidene)piperidine-1-carboxylateHCID 66876242HCID 66876242, compound

Product 1

HCID 66877003tert-Butyl 4-(3-fluoro-5-(5-(trifluoromethyl)pyridin-2-yloxy)benzylidene)piperidine-1-carboxylateYield 33.2%

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
50 °C

Procedure

To a solution of tert-butyl 4-(bromomethylene)piperidine-1-carboxylate (1.1 g, 0.0039 mol) in THF (13 mL) was added 3-fluoro-5-(5-(trifluoromethyl)pyridin-2-yloxy)phenylboronic acid (1.4 g, 4.7 mmol), potassium phosphate (2.5 g, 0.012 mol) and H2O (0.23 mL) and the mixture was degassed using argon. PdCl2(dppf)2 (0.32 g, 0.4 mmol) was added and the mixture was degassed again. The reaction was heated at 50° C. for 1.5 h and then allowed to cool to RT. Water was added and the mixture was extracted with ethyl acetate three times. The organic layer was washed with brine, dried over Na2SO4 and evaporated to dryness. The residue was purified by silica gel column chromatography (2-4% ethyl acetate in hexane) to give the title compound (0.585 g, 19%). 1H NMR (500 MHz, CDCl3): δ 8.45 (s, 1H), 7.94 (d, J=8.6 Hz, 1H), 7.05 (d, J=8.65 Hz, 1H), 6.81-6.75 (m, 3H), 6.30 (s, 1H), 3.51 (t, J=5.55 Hz, 2H), 3.42 (t, J=5.6 Hz, 2H), 2.47 (t, J=5.55 Hz, 2H), 2.33 (m, 2H), 1.47 (s, 9H).

Workup

  1. customthe mixture was degassed
  2. customthe mixture was degassed again
  3. temperatureto cool to RT
  4. additionWater was added
  5. extractionthe mixture was extracted with ethyl acetate three times
  6. washThe organic layer was washed with brine
  7. dry with materialdried over Na2SO4
  8. customevaporated to dryness
  9. customThe residue was purified by silica gel column chromatography (2-4% ethyl acetate in hexane)

Sources & evidence

ORD record
ord-b76ad7754c9349dfbd72127dcbdbee9d
Source dataset
uspto-grants-2011_10
Patent number
US08044052B2

Reaction notes

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