Hydrochloric Acid → 4-Methoxy-2-(trifluoromethyl)phenylboronic acid

Temperature

23 °C

A solution of 4-bromo-3-trifluoromethylanisole (13 g, 50 mmol) in dry THF (110 mL) was treated with butyllithium solution (2.5 M in hexane, 24 mL, 60 mmol) during ca. 5 min at −78° C. under nitrogen. After 15 min, the solution was treated with triisopropyl borate (23 mL, 100 mmol) during ca. 5 min at −78° C. After a further 30 min, the cooling bath was removed and the reaction solution was warmed to 23° C. and left for 3.5 h. At this time, the resulting opaque mixture was concentrated in vacuo and the residue was treated with 1 N aqueous hydrogen chloride (110 mL, 110 mmol) and extracted with ethyl acetate (3×75 mL). The combined extracts were washed with water (2×100 mL) and brine (100 mL), dried (Na2SO4), and concentrated in vacuo to give the crude product as a tacky yellow solid (11 g) which was triturated overnight with hexane (100 mL). Vacuum filtration gave the title compound (7.9 g, 72%) as a white solid which was pure enough for further use.

1. waitAfter a further 30 min
2. customthe cooling bath was removed
3. waitleft for 3.5 h
4. concentrationAt this time, the resulting opaque mixture was concentrated in vacuo
5. extractionextracted with ethyl acetate (3×75 mL)
6. washThe combined extracts were washed with water (2×100 mL) and brine (100 mL)
7. dry with materialdried (Na2SO4)
8. concentrationconcentrated in vacuo
9. customto give the crude product as a tacky yellow solid (11 g) which
10. customwas triturated overnight with hexane (100 mL)
11. filtrationVacuum filtration

ORD record

ord-578068fa55374e42a201607dcef48310

Source dataset

uspto-grants-2004_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06835745B2