Ethanol → 1-(Pyridin-4-yl)pyrrolidin-3-ol

Temperatur

150 °C

A mixture of 3-hydroxypyrrolidine (9.9 g, 113.64 mmol), 4-bromopyridinium hydrochloride (22.098 g, 113.64 mmol), triethylamine (47.5 mL, 341.0 mmol) and 3:1 ethanol:water (150 mL), in a pressure tube reaction vess 1, was purged with nitrogen and sealed. The mixture was heated to 150° C. for 96 hours and cooled. The solvent was evaporated and ethyl acetate (50 mL) was added. After trituration, the organic solvent was decanted off and saved. Methylene chloride (80 mL) and 2 N sodium hydroxide (60 mL) were added to the solid. The mixture was shaken vigorously and was filtered with water and methylene chloride wash to give the title compound as an off-white solid. The organic supernatant and the methylene chloride and water washes were combined. This mixture was extracted with methylene chloride. The organic layer was sodium sulfate dried and concentrated. The residue was triturated with methylene chloride and the solid was filtered. This solid was combined with the solid from above and vacuum dried (100° C. at 133 Pa for 14 hours) to give the title compound as an off-white solid (8.52 g, 46%).

1. customwas purged with nitrogen
2. customsealed
3. temperaturecooled
4. customThe solvent was evaporated
5. additionethyl acetate (50 mL) was added
6. customAfter trituration, the organic solvent was decanted off
7. additionMethylene chloride (80 mL) and 2 N sodium hydroxide (60 mL) were added to the solid
8. filtrationwas filtered with water and methylene chloride
9. washwash

ORD-Eintrag

ord-e7768be8b1d24c5a9da95512efdf36a1

Quelldatensatz

uspto-grants-2004_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06759414B2