Tributylvinyltin → 2-Pyridinemethanol, 4-ethenyl-

Temperatur

50 °C

Bis(triphenylphosphine)palladium(II) dichloride (94 mg, 0.134 mmol) was added to a degassed solution of (4-bromo-pyridin-2-yl)-methanol (252 mg, 1.34 mmol) and tributyl(vinyl)tin (0.588 mL, 2.01 mmol) in toluene (10 mL) under nitrogen and the reaction mixture was stirred at 50° C. for 18 hours. Additional tributyl(vinyl)tin (0.176 mL, 0.67 mmol) and bis(triphenylphosphine)palladium(II) dichloride (47 mg, 0.067 mmol) were added and stirring was continued for 18 hours at 80° C. under nitrogen. The reaction mixture was cooled to room temperature and silica gel was added. The solvent was evaporated and the residue was purified by silica gel chromatography using a gradient of iso-hexanes/ethyl acetate 1:2 to 1:4 to afford the title compound (282 mg, 1.34 mmol) as a yellow oil. 1H NMR (300 MHz, CDCl3) δ3.60-3.80 (br s, 1H), 4.78 (s, 2H), 5.52 (d, J=10.9 Hz, 1H), 6.01 (d, J=17.6 Hz, 1H), 6.69 (dd, J=17.6, 10.9 Hz, 1H), 7.22 (d, J=5.4 Hz, 1H), 7.27 (s, 1H), 8.52 (d, J=5.4 Hz, 1H).

1. stirringstirring
2. waitwas continued for 18 hours at 80° C. under nitrogen
3. temperatureThe reaction mixture was cooled to room temperature
4. additionsilica gel was added
5. customThe solvent was evaporated
6. customthe residue was purified by silica gel chromatography

ORD-Eintrag

ord-55e3236e3a79477eb39177c83592a90e

Quelldatensatz

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08933015B2