5-溴-2-二氟甲氧基苯甲醛

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To an ice-cold solution of 2,2,5,5-tetramethyldihydrofuran-3-one (3.60 g, 0.025 mol) in anhydrous 1,2-dimethoxyethane (8 ml) is added sodium methoxide (1.51 g, 0.028 mol) in one portion. After stirring at this temperature for 5 minutes a solution of 5-bromo-2-difluoromethoxy-benzaldehyde (5.66 g, 0.023 mol) in 1,2-dimethoxyethane (8 ml) is added dropwise over 10 mins, followed by stirring at 0° C. for a further 1 hour. 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 sulfate and evaporated in vacuo to afford 4-[1-(5-bromo-2-difluoromethoxyphenyl)methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (8.89 g) as an orange oil. is added dropwise over 10 mins After warming to room temperature the reaction mixture washed with 2M hydrochloric acid (×2) dried over magnesium sulfate evaporated in vacuo

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To an ice-cold solution of 2,2,5,5-tetramethyldihydrofuran-3-one (3.60 g, 0.025 mol) in anhydrous 1,2-dimethoxyethane (8 ml) is added sodium methoxide (1.51 g, 0.028 mol) in one portion. After stirring at this temperature for 5 minutes a solution of 5-bromo-2-difluoromethoxy-benzaldehyde (5.66 g, 0.023 mol) in 1,2-dimethoxyethane (8 ml) is added dropwise over 10 mins, followed by stirring at 0° C. for a further 1 hour. 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 sulfate and evaporated in vacuo to afford 4-[1-(5-bromo-2-difluoromethoxyphenyl)methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (8.89 g) as an orange oil. is added dropwise over 10 mins After warming to room temperature the reaction mixture washed with 2M hydrochloric acid (×2) dried over magnesium sulfate evaporated in vacuo

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To an ice-cold solution of 2,2,5,5-tetramethyldihydrofuran-3-one (3.60 g, 0.025 mol) in anhydrous 1,2-dimethoxyethane (8 ml) is added sodium methoxide (1.51 g, 0.028 mol) in one portion. After stirring at this temperature for 5 minutes a solution of 5-bromo-2-difluoromethoxy-benzaldehyde (5.66 g, 0.023 mol) in 1,2-dimethoxyethane (8 ml) is added dropwise over 10 mins, followed by stirring at 0° C. for a further 1 hour. 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 sulfate and evaporated in vacuo to afford 4-[1-(5-bromo-2-difluoromethoxyphenyl)methylidene]-2,2,5,5-tetramethyldihydrofuran-3-one (8.89 g) as an orange oil. is added dropwise over 10 mins After warming to room temperature the reaction mixture washed with 2M hydrochloric acid (×2) dried over magnesium sulfate evaporated in vacuo