Реакция #2139925

Уравнение реакции

HCl

butyllithium

bromobiphenyl

trimethylborate

→

biphenylboronic acid

Растворители

Условия реакции

Обработка

1. 1
   workup.STIRRINGat −95° C., and the solution was stirred for 2 hours at −78° C.
2. 2
   workup.WAITfor 12 hours at room temperature
3. 3
   Другоеat 0° C.
4. 4
   workup.DISTILLATIONthe solvent was distilled
5. 5
   ЭкстракцияThe reaction product was extracted with ether

Методика

5 g of bromobiphenyl was dissolved in 100 mL of tetrahydrofuran(THF), and the solution was cooled to −95° C. Then, 20.2 mL of 1.6M butyllithium was added thereto and stirred for 5 minutes. 24.31 mL of trimethylborate was added thereto at −95° C., and the solution was stirred for 2 hours at −78° C., and for 12 hours at room temperature. Then, 10% HCl solution was added thereto at 0° C. to adjust the pH of the solution to be less than 6, and the solvent was distilled. The reaction product was extracted with ether to obtain biphenylboronic acid. Thereafter, as shown in the following reaction 4, 0.08 g of bromospiro-dimer, 0.034 g of biphenyl boric acid, 0.003 g of Pd(TPP)4 catalyst, 0.11 ml of 2M Na2CO3 were refluxed in 1,2-dimethoxyethane solvent while stirring for 24 hours (Suzuki coupling reaction) to obtain the target compound.

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