Trimethyl borate → (2-Chloro-5-isopropylphenyl)boronic acid

To a solution of 2-bromo-1-chloro-4-isopropylbenzene (0.37 g, 1-59 mmol) in dry THF (5 mL) at −78° C., n-butyl lithium (0.76 mL, 1.90 mmol, 2.5 M) was added. The solution was stirred at −78° C. for 30 min. Trimethyl borate (0.53 mL, 4.76 mmol) was added. The solution was stirred at −78° C. for 2.5 h. The reaction was quenched with saturated aqueous NH4Cl. The aqueous layer was extracted with EtOAc (3×15 mL). The combined EtOAc layers were dried over Na2SO4. The residue was used without further purification after evaporation of the solvent.

1. stirringThe solution was stirred at −78° C. for 2.5 h
2. customThe reaction was quenched with saturated aqueous NH4Cl
3. extractionThe aqueous layer was extracted with EtOAc (3×15 mL)
4. dry with materialThe combined EtOAc layers were dried over Na2SO4
5. customThe residue was used without further purification
6. customafter evaporation of the solvent

ORD-Eintrag

ord-825e77c2745847b698af8325c8d8247c

Quelldatensatz

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07910592B2