反应详情

温度

0 °C

To an ice-cold solution of 2,2,5,5-tetramethyldihydrofuran-3-one (2.84 g, 20.00 mmol) in anhydrous 1,2-dimethoxyethane (6 ml) is added sodium methoxide (1.19 g, 22.04 mmol) in one portion. After stirring at this temperature for 5 minutes a solution of 5-bromo-2-trifluoromethoxybenzaldehyde (4.84 g, 18.00 mmol) in 1,2-dimethoxyethane (6 ml) is added dropwise over 10 mins, followed by stirring at 0° C. for a further 1hour. After warming to room temperature the reaction mixture is diluted with ether and washed with 2M hydrochloric acid (×2). Organic fractions are combined, dried over magnesium sulphate, filtered and the filtrate evaporated in vacuo to afford 4-[1-(5-bromo-2-trifluoromethoxyphenyl)-methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (7.06 g) as an orange liquid.

1. additionis added dropwise over 10 mins
2. temperatureAfter warming to room temperature the reaction mixture
3. washwashed with 2M hydrochloric acid (×2)
4. dry with materialdried over magnesium sulphate
5. filtrationfiltered
6. customthe filtrate evaporated in vacuo