Potassium Carbonate → (E)-2-Methoxy-4-styrylpyridine

HRID 2387509Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][N:5]=[C:4]([O:8][CH3:9])[CH:3]=1.[C:10]1(/[CH:16]=[CH:17]/B(O)O)[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.C([O-])([O-])=O.[K+].[K+]>CS(C)=O>[CH3:9][O:8][C:4]1[CH:3]=[C:2](/[CH:17]=[CH:16]/[C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH:7]=[CH:6][N:5]=1

Participants

Conditions

Temperature: 90 °C

Procedure

4-Bromo-2-methoxypyridine (1.85 g, 9.84 mmol), (E)-phenylvinylboronic acid (4.3 g, 30 mmol), K2CO3 (4.0 g, 30 mmol) and [1,1′-Bis-(diphosphenylphosphino)ferrocene]dichloropalladium(II) (PdCl2dppf) (400 mg, 0.5 mmol) were stirred in DMSO (15 mL) under vacuum for 30 min. The flask was flushed with nitrogen and the mixture was heated at 90° C. for 30 min. Upon cooling, the mixture was diluted with methylene chloride and washed with 5% lithium chloride solution (5×), dried, concentrated, and the residue was purified by column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25) to provide the title compound (1.93 g, 93%) as an orange oil: 1H NMR (300 MHz, CDCl3) δ 8.12 (d, J=5.2 Hz, 1H), 7.51 (m, 2H), 7.40-7.22 (m, 4H), 7.02-6.94 (m, 2H), 6.78 (s, 1H), 3.95 (s, 3H).

Workup

customThe flask was flushed with nitrogen
temperatureUpon cooling
additionthe mixture was diluted with methylene chloride
washwashed with 5% lithium chloride solution (5×)
customdried
concentrationconcentrated
customthe residue was purified by column chromatography (silica gel, hexanes/ethyl acetate, 97:3 to 75:25)

Sources & evidence

ORD record: ord-447a5dfefe9e400dbca9900739780589
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08268868B2

Reaction notes

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