Toluene → Ethyl 2-(3,4,5-trimethoxyphenyl)pyridine-4-carboxylate

HRID 2300290Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:4]=[C:5](B(O)O)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10].Cl[C:17]1[CH:18]=[C:19]([CH:25]=[CH:26][N:27]=1)[C:20]([O:22][CH2:23][CH3:24])=[O:21].C1(C)C=CC=CC=1.C(=O)([O-])[O-].[Na+].[Na+]>[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C(OCC)(=O)C.C1COCC1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:17]2[CH:18]=[C:19]([CH:25]=[CH:26][N:27]=2)[C:20]([O:22][CH2:23][CH3:24])=[O:21])[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10]

Participants

Conditions

Temperature: 90 °C

Procedure

3,4,5-Trimethoxyphenylboronic acid (20.10 g) and ethyl 2-chloroisonicotinate (18.56 g) were suspended in a mixted solvent of toluene (200 mL) and THF(100 mL), and to the suspension 2 M sodium carbonate (200 mL) and tetrakis(triphenyl phosphine) palladium(0) (5.78 g) were added. The mixture was stirred at 90° C. overnight under an argon atmosphere. Ethyl acetate was added to the reaction mixture to separate an organic layer. The organic layer was washed with brine, dried over anhydrous sodium magnesium and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel using hexane-ethyl acetate (5:1) to give the title compound.

Workup

customto separate an organic layer
washThe organic layer was washed with brine
dry with materialdried over anhydrous sodium magnesium
concentrationconcentrated under reduced pressure
customThe residue was purified by column chromatography on silica gel

Sources & evidence

ORD record: ord-7e15c98146fe4ba599395979c813e6ff
Source dataset: uspto-grants-2002_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06498169B1

Reaction notes

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