1,2-Dimethoxyethane → 4-Methyl-2-phenylpyridine

HRID 713565Notes

Reaction equation

HRID 713565 reaction equation
Cl[C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[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>[CH3:8][C:6]1[CH:5]=[CH:4][N:3]=[C:2]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)[CH:7]=1

Participants

7

Reactant 4

HCID 80711,2-DimethoxyethaneHCID 11430Potassium CarbonateHCID 66827Phenylboronic AcidHCID 772482-Chloro-4-methylpyridine

Product 1

HCID 770264-Methyl-2-phenylpyridineYield 84.4%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent

Procedure

A 1 L round bottom flask was charged with 2-chloro-4-methylpyridine (25 g, 196 mmol), phenylboronic acid (23.9 g, 196 mmol), potassium carbonate (81 g, 588 mmol), Pd(PPh3)4 (2.3 g, 1.9 mmol), dimethoxyethane (500 mL) and water (150 mL). The reaction mixture was degassed with nitrogen and heated to reflux for 22 h. After cooling, the aqueous layer was extracted with EtOAc; the organic portion was combined and subjected to column chromatography (SiO2, 5% EtOAc in hexane to 10% EtOAc in hexane) to give 28 g (78%) of 4-methyl-2-phenylpyridine. The product was confirmed by NMR and GC/MS.

Workup

  1. customThe reaction mixture was degassed with nitrogen
  2. temperatureheated
  3. temperatureto reflux for 22 h
  4. temperatureAfter cooling
  5. extractionthe aqueous layer was extracted with EtOAc

Sources & evidence

ORD record
ord-b225e54929f14cb6930e76c00e1668de
Source dataset
uspto-grants-2015_11
Patent number
US09184397B2

Reaction notes

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