| 83.3% |
With sodium tetrahydroborate; In tetrahydrofuran; methanol; at 0℃; for 5.0h;Cooling with ice; |
A three-necked flask having a capacity of 2 liters was charged with 109.2g of dimethyl 5-bromo-isophthalate and then with 400 ml of tetrahydrofuran (THF), to prepare a solution of dimethyl 5-bromoisophthalate. The solution was mixed with 16.6g of sodium borohydride and the resultant mixture liquid was agitated while cooling the mixture liquid with ice pieces. Separately, 40.5 ml of methyl alcohol were dissolved in 150 ml of THF, the resultant solution was mixed in the ice-cooled mixture liquid. Then, the resultant reaction mixture liquid was agitated for 5 hours while cooling with ice pieces. The reaction mixture liquid was added with 380 ml of water to terminate the reaction, and then mixed with a 1 mole hydrochloric acid solution to adjust the pH value of the reaction mixture liquid to 7.0. The resultant reaction mixture liquid was subjected to an extraction treatment with 380 ml of ethyl acetate and then with 200 ml of ethyl acetate. The resultant organic extract liquids were mixed with each other, and the resultant mixed extract liquid was washed with 300 ml of water and then with 80 ml of a saturated aqueous common salt solution, and the resultant washed extract liquid was dried with a drying agent consisting of anhydrous magnesium sulfate. The dried extract liquid was filtered to separate the drying agent, and the resultant filtrate was concentrated. A crude product of the target compound, namely methyl 5-bromo-3-(hydroxymethyl)benzoate was obtained in an amount of 96.5g. In the crude product, the mass ratio of the target compound, namely methyl 5-bromo-3-(hydroxymethyl)benzoate to the by-product consisting of 5-bromo-3-(hydroxymethyl)benzyl alcohol was 88:10, as determined by NMR measurement. The crude product was dissolved in 160 ml of methyl alcohol; the resultant solution was placed in a separatory funnel and mixed with 160 ml of water and 1000 ml of xylene; and the resultant mixture liquid was subjected to a phase separation. The resultant organic phase fraction was collected, washed with 160 ml of a solution of methyl alcohol in water in volume ratio of 1:1, then with 160 ml of water and finally with 160 ml of a saturated aqueous common salt solution. The washed organic phase fraction was dried with a drying agent consisting of anhydrous magnesium sulfate. The dried solution was subjected to a filtration procedure to remove the drying agent from the organic phase fraction. Then, the filtrate was concentrated. The target compound, namely, purified methyl 5-bromo-3-(hydroxymethyl)benzoate was obtained in an amount of 81.98g. The yield thereof was 83.3%. In the resultant purified product, a mass ratio of the target compound, methyl 5-bromo-3-(hydroxymethyl)benzoate to a by-product, namely, 5-bromo-3-(hydroxymethyl)benzyl alcohol was 96:1.8, determined by the NMR measurement. The results of the 1H-NMR measurement (200 MHz, delta ppm, CDCl3) were as follows 3.93(s, 3H), 4.74 (d, J = 5.6 Hz, 2H) 7.73 (s, 1H), 7.95 (s, 1H), 8.09 (s, 1H). |
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