反应详情

温度

-78 °C

2-bromo-6-(trans-4-tert-butylcyclohexyloxy)naphthalene (2.249 g, 6.25 mmol, 1.0 eq.) was dissolved in THF (10 mL) under nitrogen atmosphere. Then the mixture was cooled down to −78° C. and a solution of n-BuLi in THF (2.5 M, 7.5 mL, 18.8 mmol, 3.0 eq.) was added to the mixture dropwise. The mixture was stirred at −78° C. for 15 min. then DMF (2.4 mL, 31.2 mmol, 5.0 eq.) was added to the mixture and stirred at −78° C. for 1 h. When the reaction completed, 1 M HCl was added to adjust the pH to 6. The mixture was extracted with EtOAc and the organic layer was concentrated and purified by silica gel chromatography using petroleum ether/ethyl acetate (10/1) as eluent to give 6-(trans-4-tert-butylcyclohexyloxy)-2-naphthaldehyde as a white solid (1.16 g, 60%). EDI-MS: 311.1 (M+H)+. 1H NMR (400 MHz, CDCl3) δ 10.08 (s, 1H), 8.24 (s, 1H), 7.92-7.87 (m, 2H), 7.77 (d, 1H), 7.22-7.19 (m, 2H), 4.42-4.30 (m, 1H), 2.30-2.28 (m, 2), 1.93-1.90 (m, 2H), 1.48-1.11 (m, 5H), 0.82 (s, 9H).

1. stirringstirred at −78° C. for 1 h
2. extractionThe mixture was extracted with EtOAc
3. concentrationthe organic layer was concentrated
4. custompurified by silica gel chromatography