1,2-Dimethoxyethane → 5-Chloro-2-phenylpyridine

HRID 2369736Notes

Reaction equation

HRID 2369736 reaction equation
Cl[C:2]1[CH:7]=[CH:6][C:5]([Cl:8])=[CH:4][N:3]=1.[C:9]1(B(O)O)[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1.C(=O)([O-])[O-].[K+].[K+].C(COC)OC>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[Cl:8][C:5]1[CH:6]=[CH:7][C:2]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[N:3][CH:4]=1

Participants

7

Reactant 4

HCID 80711,2-DimethoxyethaneHCID 11430Potassium CarbonateHCID 276852,5-DichloropyridineHCID 66827Phenylboronic Acid

Product 1

HCID 27628665-Chloro-2-phenylpyridineYield 73%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Procedure

2,5-Dichloropyridine (30 g, 203 mmol), phenylboronic acid (24.72 g, 203 mmol) and potassium carbonate (84 g, 608 mmol) were added to dimethoxyethane (500 mL) and water (100 mL). The reaction mixture was degassed with nitrogen for 20 min, and Pd(PPh3)4 (2.3 g, 2.0 mmol) was added and reaction mixture was allowed to reflux for 18 h. The reaction was cooled to room temperature, the aqueous layer removed and dimethoxyethane was concentrated to dryness by rotary evaporation under vacuum. The residue was dissolved in DCM and passed through a silica gel plug, eluting with DCM. The solvent was removed and the crude product was chromatographed on silica with 40/60 (v/v) DCM/hexane to 50/50 (v/v) DCM/hexane to yield 28 g (73%) of the product as a white solid (HPLC purity: 99.7%).

Workup

  1. customThe reaction mixture was degassed with nitrogen for 20 min
  2. customreaction mixture
  3. temperatureto reflux for 18 h
  4. customthe aqueous layer removed
  5. concentrationdimethoxyethane was concentrated to dryness by rotary evaporation under vacuum
  6. dissolutionThe residue was dissolved in DCM
  7. washeluting with DCM
  8. customThe solvent was removed
  9. customthe crude product was chromatographed on silica with 40/60 (v/v) DCM/hexane to 50/50 (v/v) DCM/hexane

Sources & evidence

ORD record
ord-7438b2c4270a4cd3904539568b49debb
Source dataset
uspto-grants-2014_04
Patent number
US08709615B2

Reaction notes

Loading…