反应详情

To a solution of 8-(benzyloxymethyl)-8-ethynyl-1,4-dioxaspiro[4.5]decane (Reference Example 87) (393 mg, 1.37 mmol) in tetrahydrofuran (4.6 mL), 2.6 M n-butyllithium (solution in hexane, 0.555 mL, 1.44 mmol) was added at −78° C., and the obtained solution was stirred for 10 minutes. Further, 4-methylbenzaldehyde (0.178 mL, 1.51 mmol) was added, and the obtained solution was allowed to warm gradually to room temperature and stirred for 1 hour. Saturated aqueous ammonium chloride solution was added to the reaction solution, and the resulting solution was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate) to obtain the captioned compound (459 mg, 1.13 mmol, 82%) as a colorless oily compound.

1. stirringstirred for 1 hour
2. extractionthe resulting solution was extracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by flash chromatography (silica gel, n-hexane/ethyl acetate)