2-Cyclohexen-1-one, 4,4-dimethyl- → 1,4,4-Trimethylcyclohex-2-en-1-ol

To a stirred solution of 4,4-dimethylcyclohex-2-enone (40.0 g, 322 mmol) in anhydrous diethyl ether (400 mL) at −78° C. was added an ethereal solution of methyllithium (220 mL of a 1.6 M). The resulting solution was allowed to warm to room temperature, stirred for 18 hours. The reaction was quenched by the addition of water (200 mL). The phases were separated and the aqueous layer extracted with diethyl ether (2×200 mL). The combined organic phase was washed with water (2×200 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the title compound as clear, light yellow oil (41 g, Yield: 90%). Rf 0.5 (5:1 petroleum ether/ethyl acetate); 1H NMR (400 MHz, CDCl3) δ 5.46 (d, J=10.0 Hz, 1H), 5.43 (d, J=10.0 Hz, 1H), 1.73-1.70 (m, 2H), 1.59-1.56 (m, 1H), 1.50-1.45 (m, 1H), 1.27 (s, 3H), 1.01 (s, 3H), 0.95 (s, 3H) ppm; Mass spectrum (ESI +ve) m/z 123 (M−H2O+H+).

1. customThe reaction was quenched by the addition of water (200 mL)
2. customThe phases were separated
3. extractionthe aqueous layer extracted with diethyl ether (2×200 mL)
4. washThe combined organic phase was washed with water (2×200 mL)
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure

ORDレコード

ord-66182e46708d4a63b1e260bee4bfe083

出典データセット

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US09353063B2