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With hydrogenchloride; n-butyllithium; In tetrahydrofuran; hexane; toluene;
(8) Synthesis of Compound 2-8 Under an argon gas atmosphere, a mixture of 208.8 g (737.4 mmol) of 1-(4-bromophenyl) naphthalene and 2.1 L of dehydrated THF was cooled down to -60 degrees C., and added with 567 mL (884.9 mmol) of hexane solution of 1.56M n-butyllithium in drops while being stirred. Then, the reaction mixture was stirred for two hours at -60 degree C. 416 g (2.21 mol) of triisopropyl borate was dropped into the reaction solution at -60 degrees C. Subsequently, the reaction mixture was stirred for 17 hours at room temperature. The reaction mixture was further added with solution of hydrochloric acid to be stirred for one hour at room temperature. After the reaction, the reaction mixture was further added with toluene, so that aqueous phase thereof was eliminated. After organic phase thereof was dried with magnesium sulfate, the solvent was distilled away under reduced pressure. By recrystallizing the obtained solid by toluene, 126 g of 4-(1-naphthyl) phenylboronic acid was obtained at an yield of 67%.
Under an argon gas atmosphere, a mixture of 208.8 g (737.4 mmol) of 1-(4-bromophenyl)naphthalene and 2.1 L of dehydrated TI-IF was cooled down to minus 60 degree C. Then, 567 ml (884.9 mmol) of hexane solution of 1.56M n-butyllithium was dropped into the mixture while the mixture was being stirred. The reaction mixture was further stirred at minus 60 degrees for 2 hours. 416 g (2.21 mol) of triisopropylborate was dropped into the reaction mixture at minus 60 degrees C. The reaction mixture was then stirred at room temperature for 17 hours. The reaction mixture was added with aqueous solution of hydrochloric acid and stirred at room temperature for 1 hour. After the reaction, the reaction mixture was added with toluene, and aqueous phase thereof was eliminated. Then, organic phase thereof was dried with magnesium sulfate, and the solvent was distilled away under reduced pressure. By recrystallizing the obtained solid by toluene, 126 g of 4-(1-naphthyl)phenylboronic acid was obtained at an yield of 67%.
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