Water → (4-fluoropyridin-2-yl)Methanol

温度

-78 °C

To a solution of methyl 4-fluoropicolinate (0.50 g, 3.20 mmol) in tetrahydrofuran (20 mL) at −78° C. was added slowly lithium aluminum hydride (0.15 g, 4.00 mmol). The solution was stirred at −78° C. for 2 h and water (1 mL) was added. The reaction mixture was allowed to warm to ambient temperature, dried over magnesium sulfate, filtered and concentrated in vacuo to afford (4-fluoropyridin-2-yl)methanol as a pale yellow oil. To a solution of this oil in dichloromethane (10 mL) was added thionyl chloride (1.0 mL, 13 mmol) and the solution was stirred at ambient temperature for 16 h. The solution was concentrated in vacuo to afford 2-(chloromethyl)-4-fluoropyridine hydrochloride (0.42 g, 71%) as a beige solid: 1H NMR (300 MHz, CDCl3) δ 8.53-8.47 (m, 1H), 7.04-6.90 (m, 2H), 4.74 (s, 2H).

1. temperatureto warm to ambient temperature
2. dry with materialdried over magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo

ORDレコード

ord-f24a8a57eaf0426eb8c955bbee198499

出典データセット

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08263606B2