Potassium Carbonate → EThyl (2E)-3-(2,6-dichloropyridin-3-yl)prop-2-enoate

To a solution of 2,6-dichloro-3-iodopyridine (3.0 g, 10.95 mmol), (E)-ethyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)acrylate (2.476 g, 10.95 mmol), and Dichloro[1,1′-bis(di-tert-butylphosphino)ferrocene]palladium (II) (0.357 g, 0.548 mmol) in THF (81 mL) was added 1M (aq) K2CO3 (54.8 mL, 54.8 mmol). A steady stream of N2 was bubbled through the resultant mixture for 5 minutes. Stirring was continued at ambient temperature for 2 h then the mixture was diluted with EtOAc and the organic layer washed successively with water (1×) and brine (1×). The organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica gel column chromatography using a gradient of 0-30% EtOAc/Hexanes as eluent to give the title compound as a tan solid. 1H NMR δ (ppm) (CHCl3-d): 7.95 (1H, d, J=16 Hz), 7.90 (1H, d, J=8.1 Hz), 7.35 (1H, d, J=8.1 Hz), 6.47 (1H, d, J=16 Hz), 4.32 (2H, q, J=7.15 Hz), 1.38 (3H, t, J=7.14 Hz). MS (M+H)+: 245.

1. customA steady stream of N2 was bubbled through the resultant mixture for 5 minutes
2. additionthe mixture was diluted with EtOAc
3. washthe organic layer washed successively with water (1×) and brine (1×)
4. dry with materialThe organic layer was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by silica gel column chromatography

ORD-Eintrag

ord-5ecabadc1d5245c9a80235e95ca7d05e

Quelldatensatz

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09243002B2