Sodium Carbonate → 4-(3-Methoxy-4-nitrophenyl)pyridine

HRID 1014187Notes

Reaction equation

Cl[C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[C:4]([O:11][CH3:12])[CH:3]=1.[N:13]1[CH:18]=[CH:17][CH:16]=[C:15](B(O)O)[CH:14]=1.C([O-])([O-])=O.[Na+].[Na+]>O1CCOCC1>[CH3:12][O:11][C:4]1[CH:3]=[C:2]([C:16]2[CH:17]=[CH:18][N:13]=[CH:14][CH:15]=2)[CH:7]=[CH:6][C:5]=1[N+:8]([O-:10])=[O:9]

Participants

Conditions

Temperature: 90 °C

Procedure

Nitrogen was bubbled through dioxane (800 mL) for 1 h followed by the addition of 4-chloro-2-(methyloxy)-1-nitrobenzene (61 g, 0.33 mol), 3-pyridinylboronic acid (Boron Molecular, 40 g, 0.33 mmol), dichloro(triphenylphosphine)palladium (10 g, 14 mmol), and degassed aqueous 3 N Na2CO3 (325 mL, 975 mmol). The reaction mixture was stirred with a mechanical stirrer and heated at 90° C. for 3 h. The reaction was cooled and most of the dioxane was removed in vacuo. It was diluted with water and then extracted with Ethyl acetate. Combined organic phases were dried (Mg2SO4), filtered and concentrated. The resultant solid was washed with diethyl ether to afford 4-(3-methoxy-4-nitrophenyl)pyridine (50 g, 66% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 4.05 (s, 3 H), 7.53 (dd, J=8.4, 1.8 Hz, 1 H), 7.69 (d, J=1.8 Hz, 1 H), 7.84 (d, J=6.2 Hz, 2 H), 8.02 (d, J=8.4 Hz, 1 H), 8.72 (d, J=6.2 Hz, 2 H). ESIMS (M+H)+=231.

Workup

customNitrogen was bubbled through dioxane (800 mL) for 1 h
customwas removed in vacuo
additionIt was diluted with water
extractionextracted with Ethyl acetate
dry with materialCombined organic phases were dried (Mg2SO4)
filtrationfiltered
concentrationconcentrated
washThe resultant solid was washed with diethyl ether

Sources & evidence

ORD record: ord-49ca80bb5a7b44b887e485767bcee573
Source dataset: uspto-grants-2011_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07981903B2

Reaction notes

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