Hexane → (+)-2-Methoxy-1-(pyrid-3-yl)cyclohexanol

Temperatur

20 °C

To a solution of 2.5M n-butyllithium in hexane (13.2 ml, 33 mmol) at -78° C. was added diethyl ether (15 ml) followed by a solution of 3-bromopyridine (4.7 g, 30 mmol) in ether (90 ml) over a period of 10 minutes. After 1 hour at -78° C. a solution of (±)-2-methoxycyclohexanone (3.84 g, 30 mmol) in ether (20 ml) was added dropwise during 10 minutes. After 2 hours at -78° C. and 30 minutes at 0° C. the reaction mixture was warmed to 20° C. and then poured onto ice (150 g). The mixture was extracted with ether (2×50 ml) and then the combined organic extracts were extracted with 1N hydrochloric acid (50 ml). This aqueous extract was washed with ether (20 ml) and then treated with 2M sodium hydroxide solution (25 ml) and extracted with ether (3×100 ml). The organic extracts were combined, washed with brine then dried over anhydrous sodium sulphate. Concentration in vacuo afforded (±)-2-methoxy-1-(pyrid-3-yl)cyclohexanol (5.0 g, 24 mmol) as a 4:1 mixture of cis and trans isomers;

1. additionpoured onto ice (150 g)
2. extractionThe mixture was extracted with ether (2×50 ml)
3. extractionthe combined organic extracts were extracted with 1N hydrochloric acid (50 ml)
4. extractionThis aqueous extract
5. washwas washed with ether (20 ml)
6. additiontreated with 2M sodium hydroxide solution (25 ml)
7. extractionextracted with ether (3×100 ml)
8. washwashed with brine
9. dry with materialthen dried over anhydrous sodium sulphate
10. concentrationConcentration in vacuo

ORD-Eintrag

ord-003f3d8c8e754ca59574daaeedf6427a

Quelldatensatz

uspto-grants-1993_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05246950