反应详情

温度

-50 °C

Add dropwise 374 mL (748 mmol) of a solution of iPrMgCl 2N in THF to a solution of 198 g (575 mmol) of 2-(benzyloxy)-1-chloro-4-iodobenzene in 1.2 L of anhydrous THF under argon and stirred at −50° C., maintaining the temperature between −40 and −50° C. Allow the reaction mixture to return to −10° C. and continue stirring for 1 h. Then add 172 mL (748 mmol) of triisopropyl borate and leave the reaction mixture to return slowly to RT. After stirring for 2 h, treat the mixture with 1 L of aqueous solution of HCl 5N, then extract with ether (2×600 mL). Wash the organic phase with 2×1 L of water, dry over Na2SO4 then concentrate under reduced pressure. Solidify the residue obtained in pentane, filter on a frit and wash with pentane. We thus obtain 113 g of [3-(benzyloxy)-4-chlorophenyl]boronic acid in the form of a white solid.

1. temperaturemaintaining the temperature between −40 and −50° C
2. customto return to −10° C.
3. stirringcontinue stirring for 1 h
4. customleave the reaction mixture
5. customto return slowly to RT
6. stirringAfter stirring for 2 h
7. extractionextract with ether (2×600 mL)
8. washWash the organic phase with 2×1 L of water
9. dry with materialdry over Na2SO4
10. concentrationthen concentrate under reduced pressure
11. customobtained in pentane
12. filtrationfilter on a frit
13. washwash with pentane