Sodium Chloride → 4-Methoxy-5-(5,6,7,8-tetrahydronaphthalen-2-yl)thiophene-3-carbonitrile

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Reaction Steps

3.53 g of 5-bromo-4-metoxythiophene-3-carbonitrile synthesized in accordance with WO2006062247, 3.13 g of 5,6,7,8-tetrahydronaphthalen-2-yl boronic acid synthesized above in (3), 0.21 g of palladium acetate, 6.70 g of anhydrous potassium carbonate and 5.10 g of tetrabutylammonium bromide were mixed with 30 ml of 1,2-dimethoxyethane and 30 ml of water and allowed to react at room temperature for 19 hours with stirring. After addition of 200 ml of ethyl acetate and 150 ml of saturated aqueous sodium chloride, the reaction mixture was stirred at room temperature for 1 hour. The precipitated black solid was removed by suction filtration (through Celite). The filtrate was allowed to separate, and the ethyl acetate layer was withdrawn, washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent: ethyl acetate/hexane=1/15) to obtain 3.56 g of the desired product (yield 82%).

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