Water → (1S,3R,4R,6R)-4-Bromo-3,7,7-trimethylbicyclo[4.1.0]heptan-3-ol

To a suspension of (+)-3-carene (82 g, 0.6 mol) and CaCO3 (80 g, 0.8 mol) in water (300 mL) and dioxane (600 mL) is added N-bromosuccinimide (142 g, 0.8 mol). The mixture is stirred at rt for 1 h, diluted with water (1500 mL) and extracted with diethyl ether (500 mL). The organic extract is washed with water (3×1000 mL) and 5% aq. Na2S2O3 (2×500 mL), and dried over Na2SO4. The solvent is removed under reduced pressure and the crude product is purified by column chromatography on silica gel eluting with hexane/EA 4:1 to yield (1S,3R,4R,6R)-4-bromo-3,7,7-trimethyl-bicyclo[4.1.0]heptan-3-ol (48.3 g) as a beige solid. 1H NMR (CDCl3): δ 4.05 (dd, J=7.6, 10.6 Hz, 1H), 2.48-2.36 (m, 2H), 2.20 (dd, J=10.0, 14.7 Hz, 1H), 1.42-1.38 (m, 1H), 1.36 (s, 3H), 1.02 (s, 3H), 0.98 (s, 3H), 0.90-0.80 (m, 1H), 0.72-0.66 (m, 1H).

1. extractionextracted with diethyl ether (500 mL)
2. extractionThe organic extract
3. washis washed with water (3×1000 mL) and 5% aq. Na2S2O3 (2×500 mL)
4. dry with materialdried over Na2SO4
5. customThe solvent is removed under reduced pressure
6. customthe crude product is purified by column chromatography on silica gel eluting with hexane/EA 4:1

ORD-Eintrag

ord-fa6535d0463343269a059b66563e9fd2

Quelldatensatz

uspto-grants-2010_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07750040B2