反应详情

A stirred mixture of 4.38 g (19.6 mmol) of 1-bromo-naphtalen-3-ol (prepared according to the procedure of M. S. Newman, V. Sankaran, D. R. Olson, J. Am. Chem. Soc. 1976, 98, 3237–3242), 5.52 g (19.6 mmol) of 1-bromo-2-triisopropylsilyloxy-ethane, 13.56 g (98.1 mmol) of potassium carbonate and 1.45 g (3.9 mmol) of tetrabutylammonium iodide in 50 mL of dimethylformamide is heated to 60° C. for 4 hours. Then an additional 0.55 g (2.0 mmol) of 1-bromo-2-triisopropylsilyloxy-ethane are added and stirring is continued for another hour at 60° C., after which TLC analysis indicated complete consumption of 1-bromo-naphtalen-3-ol. The mixture is allowed to cool to room temperature and brine is added. The resulting solution is extracted with ethyl acetate. The organic solution is washed twice with brine and the combined aqueous layers are back extracted with ethyl acetate. The organic layers are combined, dried, filtered and concentrated under reduced pressure. The oily brown residue is purified by column chromatography on silica gel (97.5:2.5 n-hexane/diethylether) to afford above title compound as a brown solid.

1. customprepared
2. waitis continued for another hour at 60° C.
3. customconsumption of 1-bromo-naphtalen-3-ol
4. additionbrine is added
5. extractionThe resulting solution is extracted with ethyl acetate
6. washThe organic solution is washed twice with brine
7. extractionthe combined aqueous layers are back extracted with ethyl acetate
8. customdried
9. filtrationfiltered
10. concentrationconcentrated under reduced pressure
11. customThe oily brown residue is purified by column chromatography on silica gel (97.5:2.5 n-hexane/diethylether)