1,2-Dimethoxyethane → Ethyl [2,4'-bipyridine]-3-carboxylate

HRID 240392Notes

Reaction equation

Cl[C:2]1[N:12]=[CH:11][CH:10]=[CH:9][C:3]=1[C:4]([O:6][CH2:7][CH3:8])=[O:5].[N:13]1[CH:18]=[CH:17][C:16](B(O)O)=[CH:15][CH:14]=1.C(=O)([O-])[O-].[Na+].[Na+].COCCOC>O.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>[N:12]1[CH:11]=[CH:10][CH:9]=[C:3]([C:4]([O:6][CH2:7][CH3:8])=[O:5])[C:2]=1[C:16]1[CH:17]=[CH:18][N:13]=[CH:14][CH:15]=1

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of ethyl 2-chloronicotinate (16.2 g), pyridine-4-boronic acid (12.9 g), sodium carbonate (27.8 g), tetrakis(triphenylphosphine)palladium(0) (5.04 g), water (50.0 mL) and DME (250 mL) was stirred overnight at 100° C. under a nitrogen atmosphere. The reaction mixture was diluted with water, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane) to give the title compound (14.1 g).

Workup

extractionthe mixture was extracted with ethyl acetate
washThe extract was washed with saturated brine
dry with materialdried over anhydrous sodium sulfate
customThe solvent was evaporated under reduced pressure
customThe residue was purified by silica gel column chromatography (NH, ethyl acetate/hexane)

Sources & evidence

ORD record: ord-275ec4e5ac484d45a74432977b6179c8
Source dataset: uspto-grants-2014_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08648079B2

Reaction notes

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