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 dioxan (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-ca6fd665971f4b37a415754f560237dc

Quelldatensatz

uspto-grants-2010_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07846964B2