反应详情

4.3 g(18.9 mmol) of 3-(naphthalen-1-yl)-acrylic acid ethylester prepared in Preparation 6-1) and 3.95 g(18.9 mmol) of α -methyltosylmethylisocyanide disclosed in A. M. van Leusen, et al., Tetrahedron Letter, 1975, 40, 3487 were dissoved in 100 ml of tetrahydrofuran. 2.55 g(22.7 mmol) of potassium t-butoxide dissolved in 100 ml of tetrahydrofuran was slowly added thereto, which was then refluxed for 30 minutes. To the reaction solution was added 100 ml of water to stop the reaction and the solvent was removed under reduced pressure. The residue was extracted with diethylether, washed with saturated sodium chloride solution and dried over magnesium sulfate. The solvent was removed under reduced pressure and the residue was subjected to silica gel column chromatography using a solvent mixture of ethyl acetate/n-hexane(1/3, v/v) as an eluent to give 3.50 g(12.5 mmol, Yield 66%) of the title compound.

1. additionwas slowly added
2. temperaturewhich was then refluxed for 30 minutes
3. customthe reaction
4. customthe solvent was removed under reduced pressure
5. extractionThe residue was extracted with diethylether
6. washwashed with saturated sodium chloride solution
7. dry with materialdried over magnesium sulfate
8. customThe solvent was removed under reduced pressure
9. additiona solvent mixture of ethyl acetate/n-hexane(1/3