Boron trifluoride etherate → (+/-)(1R*,2R*,5S*)-5-benzyloxy-2-(4-methylsulfanyl-benzenesulfonylmethyl)-cyclohexanol

Temperatur

-78 °C

1-Methanesulfonyl-4-methylsulfanyl-benzene (3.25 g) was dissolved in THF (50 mL) and cooled to −78° C. prior to the addition of 1.6 M nBuLi (10 mL). After 0.5 h, BF3-Et2O (2.04 mL) was added followed by (±)(1S*,2R*,4S*)-4-(benzyloxy)-1,2-epoxycyclohexane (2.19 g) (Chini et al. J. Org. Chem. 1990, 55, 4265) in THF (20 mL). After an addition 1 h at −78° C., the solution was warmed to 0° C. After 2 h, the solution was cooled to −78° C. and saturated NH4Cl solution (aq) was added. The solution was warmed to rt and EtOAc was added. The organic layer was washed with brine, dried, filtered, and concentrated. Flash chromatography of the resulting residue gave (±)(1R*,2R*,5S*)-5-benzyloxy-2-(4-methylsulfanyl-benzenesulfonylmethyl)-cyclohexanol (3.5 g) as the major product: 1H NMR (CDCl3, δ ppm, 300 mHz) 1.41 (m, 2H), 1.59 (m, 1H), 1.95 (m, 1H), 2.05-2.35 (m, 2H), 2.54 (s, 3H), 2.96 (dd, 1H), 3.64 (m, 2H), 3.81 (s, 1H), 4.48 (m, 2H), 7.3 (m, 7H), 7.82 (d, 2H)

1. additionAfter an addition 1 h at −78° C.
2. temperaturethe solution was warmed to 0° C
3. waitAfter 2 h
4. temperaturethe solution was cooled to −78° C.
5. temperatureThe solution was warmed to rt
6. washThe organic layer was washed with brine
7. customdried
8. filtrationfiltered
9. concentrationconcentrated

ORD-Eintrag

ord-d12f0fca81cd4ef483d82118f4d47080

Quelldatensatz

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07087604B2