Hydrochloric Acid → (2-Methylpyridin-3-yl)methanol

Temperatur

0 °C

To a stirred solution of ethyl 2-methylnicotinate (1.50 g, 9.09 mmol) in freshly distilled THF (100 mL) at 0° C. was added diisobutylaluminum hydride (11.2 mL of a 1.5M solution in toluene, 16.9 mmol). The solution was stirred for 6 h at 0° C. and then warmed to ambient temperature. After 1 h, the solution was cooled in an ice bath and 1N HCl (75 mL) was added to quench the reaction. The mixture was made alkaline with aqueous NaOH (pH=8.5), filtered, and the solvents were concentrated under reduced pressure. The resulting aqueous solution was partitioned between CHCl3 and saturated aqueous NaHCO3. The organic layer was separated, and the aqueous layer was washed with additional CHCl3 (5×40 mL). The organic layers were combined, dried (MgSO4), and evaporated under reduced pressure. 3-Hydroxymethyl-2-methylpyridine was obtained as a slightly amber oil and was used in the next step without purification (TLC: Rf =0.40 (5% MeOH:CH2Cl2)).

1. temperaturewarmed to ambient temperature
2. waitAfter 1 h
3. temperaturethe solution was cooled in an ice bath
4. customto quench
5. customthe reaction
6. filtrationfiltered
7. concentrationthe solvents were concentrated under reduced pressure
8. customThe resulting aqueous solution was partitioned between CHCl3 and saturated aqueous NaHCO3
9. customThe organic layer was separated
10. washthe aqueous layer was washed with additional CHCl3 (5×40 mL)
11. dry with materialdried (MgSO4)
12. customevaporated under reduced pressure

ORD-Eintrag

ord-0a806a2b38c847b7b222d09354336829

Quelldatensatz

uspto-grants-1998_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05726172