甲基2,5-二(溴甲基)苯甲酸盐

反应条件: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: The compound (1.1274 g) obtained in Example 102-1 was dissolved in carbon tetrachloride (19.2 ml). The reaction solution was added with N-bromosuccinimide (2.417 g) and benzoyl peroxide (147.2 mg), and the whole was refluxed under heating for 6.5 hours. After having been cooled to room temperature, the reaction solution was concentrated under reduced pressure. The resultant residue was purified through silica gel column chromatography (hexane/ethyl acetate), thereby obtaining a mixture (2.4003 g) containing 2,5-bis-bromomethyl-benzoic acid methyl ester. The resultant mixture was dissolved in a 50% 1,4-dioxane aqueous solution (48 ml). The reaction solution was added with calcium carbonate (3.4823 g) and the whole was stirred at 100° C. for 16.5 hours. After having been cooled to room temperature, the reaction solution was cooled to 0° C. and concentrated hydrochloric acid was gradually added thereto to make the pH of the solution to 2. After that, the whole was stirred at room temperature for 20 minutes. The reaction solution was subjected to extraction with ethyl acetate. The organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and a saturated saline solution and then dried with anhydrous sodium sulfate. After the drying agent was filtrated out, the filtrate was concentrated under reduced pressure. The resultant residue was purified through silica gel column chromatography (chloroform/ethyl acetate), thereby obtaining the subject compound (372.0 mg) as a white crystal. After having been cooled to room temperature the reaction solution was cooled to 0° C. After that, the whole was stirred at room temperature for 20 minutes The reaction solution was subjected to extraction with ethyl acetate The organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution a saturated saline solution and then dried with anhydrous sodium sulfate After the drying agent was filtrated out the filtrate was concentrated under reduced pressure The resultant residue was purified through silica gel column chromatography (chloroform/ethyl acetate)

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

实验步骤: Sodium acetate (10.4 g, 126.8 mmol) was added to a solution of methyl 2,5-bis(bromomethyl)benzoate (described in J. Am. Chem. Soc., 121, 1192 (1999); 12.65 g, 39.3 mmol) in dimethyl sulfoxide (80 ml), and the mixture was stirred at room temperature for 1 hour. After a saturated aqueous solution of ammonium chloride (150 ml) was added thereto, the product was extracted with ethyl acetate. The organic layer was washed with water and then with a saturated aqueous solution of sodium chloride, and the solvent was distilled off under reduced pressure. The obtained oily residue was subjected to chromatography on a silica gel (200 g) column (eluent; ethyl acetate:hexane=1:5˜1:2) to afford the title compound (7.72 g, 70% yield) as an oil. the product was extracted with ethyl acetate The organic layer was washed with water with a saturated aqueous solution of sodium chloride, and the solvent was distilled off under reduced pressure