Triisopropyl borate → HCID 15197825, compound

Temperature

-40 °C

To a stirred solution of N-(2-bromo-5-methoxyphenyl)-2,2-dimethylpropanamide (2.82 g, 9.85 mmol) in tetrahydrofuran (20 mL) at −78° C. was added slowly a solution of n-butyllithium in hexanes (2.5 M, 8.30 mL, 20.7 mmol). The solution was stirred for 30 minutes in a −40° C. bath, then was cooled back to −78° C. Triisopropyl borate (6.82 mL, 29.6 mmol) was added slowly. The solution was stirred for 1 hour at −40° C., then was stirred at 0° C. for 30 minutes. Saturated aqueous ammonium chloride was added. The mixture was extracted with diethyl ether. The organic layers were combined, dried over sodium sulfate, filtered, and concentrated to afford a residue that was triturated with hexanes. The hexanes were decanted and the residue was stirred in methanol/water to precipitate a white solid that was isolated by filtration, washed with water, and dried to yield 1.36 g of 2-[(2,2-dimethylpropanoyl)amino]-4-methoxyphenylboronic acid, m.p. 256-257° C. The material was used in the next step without further purification.

1. temperaturewas cooled back to −78° C
2. stirringThe solution was stirred for 1 hour at −40° C.
3. stirringwas stirred at 0° C. for 30 minutes
4. extractionThe mixture was extracted with diethyl ether
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. customto afford a residue that
9. customwas triturated with hexanes
10. customThe hexanes were decanted
11. stirringthe residue was stirred in methanol/water
12. customto precipitate a white solid
13. customthat was isolated by filtration
14. washwashed with water
15. customdried

ORD record

ord-14b11b422fa449fda3130baab657ab52

Source dataset

uspto-grants-2009_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07544697B2