Sodium Carbonate → 4-Chloro-2-(2-fluorophenyl)pyridine

HRID 1430152Notes

Reaction equation

HRID 1430152 reaction equation
[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1B(O)O.[Cl:11][C:12]1[CH:17]=[CH:16][N:15]=[C:14](I)[CH:13]=1.C([O-])([O-])=O.[Na+].[Na+]>CCO.C1(C)C=CC=CC=1.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]>[Cl:11][C:12]1[CH:17]=[CH:16][N:15]=[C:14]([C:3]2[CH:4]=[CH:5][CH:6]=[CH:7][C:2]=2[F:1])[CH:13]=1

Participants

7

Reactant 3

HCID 10340Sodium CarbonateHCID 27343542-Fluorophenylboronic acidHCID 113684454-Chloro-2-iodopyridine

Product 1

HCID 457878944-Chloro-2-(2-fluorophenyl)pyridineYield 72.8%

Reagents, catalysts & solvents 3

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 702EthanolSolventHCID 1140TolueneSolvent

Conditions

Temperature
105 °C

Procedure

A mixture of 2-fluorophenylboronic acid (141 mg, 1 mmol, 1.2 eq) in EtOH (1 mL) is added to a mixture of 4-chloro-2-iodo-pyridine [Choppin, S.; Gros, P.; Fort, Y., European Journal of Organic Chemistry (2001), (3), 603-606] (200 mg, 0.84 mmol), PdCl2(dppf) (18 mg, 0.025 mmol, 0.03 equiv) and Na2CO3 (2 M solution in H2O, 1.68 mL, 3.36 mmol, 4 equiv) in toluene (2 mL) at 105° C., under an argon atmosphere. The reaction mixture is stirred at 105° C. for 1 h, allowed to cool to rt, quenched by addition of a saturated solution of NaHCO3 and extracted with EtOAc. The organic phase is washed with a saturated solution of NaHCO3, dried (Na2SO4), filtered and concentrated. The residue is purified by silica gel column chromatography (Hex/EtOAc, 1:0→97:3) to afford 127 mg of the title compound as a white solid: ESI-MS: 208.1 [M+H]+; tR=4.66 min (System 1); TLC: Rf=0.27 (Hex/EtOAc, 9:1).

Workup

  1. temperatureto cool to rt
  2. customquenched by addition of a saturated solution of NaHCO3
  3. extractionextracted with EtOAc
  4. washThe organic phase is washed with a saturated solution of NaHCO3
  5. dry with materialdried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe residue is purified by silica gel column chromatography (Hex/EtOAc, 1:0→97:3)

Sources & evidence

ORD record
ord-90ec348aa37f4aaf9c41044b98929b6c
Source dataset
uspto-grants-2015_01
Patent number
US08940771B2

Reaction notes

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