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

HRID 1267618Notes

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+]>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.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 (20.64 g) and ethyl 2-chloroisonicotinate (19.06 g) were suspended in a mixed solvent of toluene (200 mL) and THF (100 mL), and to the suspension 2 M sodium carbonate (200 mL) and tetrakis(triphenylphosphine)palladium(0) (5.93 g) were added. The mixture was stirred overnight at 90° C. under an argon atmosphere. Ethyl acetate was added to the reaction mixture to separate an organic layer. The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1) to obtain the title compound.

Workup

customto separate an organic layer
washThe organic layer was washed with saturated brine
dry with materialdried over anhydrous magnesium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by column chromatography on silica gel (hexane:ethyl acetate=5:1)

Sources & evidence

ORD record: ord-beca0628b3da4d49a84f2dfea80e5d5d
Source dataset: uspto-grants-2003_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06552188B2

Reaction notes

Loading…