3-Nitrophenylboronic Acid → 2-(3-Nitrophenyl)pyridine

HRID 2230977Notes

Reaction equation

Br[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][N:3]=1.C(=O)(O)[O-].[Na+].OB(O)[C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([N+:21]([O-:23])=[O:22])[CH:16]=1>COCCOC.CO.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+:21]([C:17]1[CH:16]=[C:15]([C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][N:3]=2)[CH:20]=[CH:19][CH:18]=1)([O-:23])=[O:22]

Participants

Conditions

Temperature: 80 °C

Procedure

To a mixture of 2-bromopyridine (1.91 ml) and tetrakis(triphenylphosphine)palladium(0) (0.46 g) in 1,2-dimethoxyethane (40 ml) was added 2M aqueous solution of sodium bicarbonate (20 ml) and a solution of dihydroxy(3-nitrophenyl)borane (3.67 g) in methanol (10 ml). The mixture was stirred at 80° C. for 2.5 hours and cooled. Then the mixture was poured into aqueous sodium bicarbonate and extracted with ethyl acetate twice. The combined organic phase was washed with aqueous sodium bicarbonate and brine, dried over magnesium sulfate and concentrated. The residue was chromatographed on silica gel (hexane-ethyl acetate (3:1)) to give 2-(3-nitrophenyl)pyridine (1.35 g).

Workup

temperaturecooled
extractionextracted with ethyl acetate twice
washThe combined organic phase was washed with aqueous sodium bicarbonate and brine
dry with materialdried over magnesium sulfate
concentrationconcentrated
customThe residue was chromatographed on silica gel (hexane-ethyl acetate (3:1))

Sources & evidence

ORD record: ord-b22717275bb94179a03dbc61dca0fa4a
Source dataset: uspto-grants-2002_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06426345B1

Reaction notes

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