反应详情

温度

50 °C

A solution [sic], maintained under an inert atmosphere, of 33.5 ml (0.1 mol) of 3M methylmagnesium chloride in solution in tetrahydrofuran is heated to 50° C. 11.3 g (0.069 mol) of 3,4-dihydro-2H-benzoxepin-5-one, dissolved in 150 ml of tetrahydrofuran, are added fairly quickly. This solution is brought to reflux for 4 hours and is then left stirring overnight at room temperature. The reaction mixture is subsequently gently hydrolysed with water under cold conditions. An ammonium chloride solution (120 g per litre) is then poured into the reaction mixture. The latter is extracted with ethyl acetate and then the organic phase is dried over anhydrous sodium sulphate and concentrated under reduced pressure. 14.7 g of a yellow oil are obtained, which oil is purified by crystallization from isoctane. 11.9 g of the title compound are thus obtained, the melting point of which is 92° C.

1. additionare added fairly quickly
2. temperatureto reflux for 4 hours
3. waitis then left
4. extractionThe latter is extracted with ethyl acetate
5. dry with materialthe organic phase is dried over anhydrous sodium sulphate
6. concentrationconcentrated under reduced pressure