3,5-二氯-4-羟基苯甲酸乙酯

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

实验步骤: To a mixture of 10.05 g ethyl 3,5-dichloro-4-hydroxybenzoate and 8.0 g 5-(3-chloropropyl)-3-methylisoxazole in 550 ml dry acetonitrile was added 4.87 g potassium hydroxide and 12.9 g potassium iodide. The reaction mixture was stirred at reflux overnight and then filtered and concentrated in vacuo. The residue was partitioned between ethyl acetate and water and the organic layer concentrated to a yellow oil. The latter was crystallized from ethyl acetate-hexane (1:4) at -50° C. to give 14 g of product, 12 g of which was used directly in the following hydrolysis reaction. A sample of the ester was purified by chromatography on silica to give pure compound, m.p. 49°-50° C. at reflux overnight filtered concentrated in vacuo The residue was partitioned between ethyl acetate and water the organic layer concentrated to a yellow oil The latter was crystallized from ethyl acetate-hexane (1:4) at -50° C.

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

实验步骤: 3,5-Dichloro-4-hydroxy-benzoic acid ethyl ester (1.0 g, 4.5 mmol, 1.0 eq) was dissolved in acetone (14 mL), NaI (0.5 eq) and K2CO3 (0.98 g, 9.0 mmol, 2.0 eq) were added ad the mixture was stirred at room temperature for 30 min. (Bromomethyl)cyclopropane (0.39 mL, 4.1 mmol, 0.9 eq) was added, and the mixture was refluxed for 2 days. The solvent was concentrated under reduced pressure, NaOH 10% was added, and it was extracted with DCM and dried. The title product (0.98 g, yield 79%) was recovered and used without further purification. was added the mixture was refluxed for 2 days The solvent was concentrated under reduced pressure, NaOH 10% was added it was extracted with DCM dried