4-Bromoaniline → 2-(5-Bromo-pyridin-2-yl)-5-chloro-pentanoic acid (4-bromo-phenyl)-amide

To a solution of 2-(5-Bromo-pyridin-2-yl)-5-chloro-pentanoic acid (1.9 g, 6.5 mmol), Et3N (3.6 mL, 26 mmol), and Pybrop (6 g, 13 mmol) in CH2Cl2 (30 mL) was added 4-bromo-phenylamine (1.45 g, 8.45 mmol). This mixture was stirred overnight at room temperature and then evaporated. The mixture was redissolved in EtOAc (40 mL) and washed with 2N HCl (20 mL×3), brine, 5% NaHCO3 (20 mL×3), brine, dried with Na2SO4, filtered and evaporated. The residue was purified by column chromatography on silica gel using hexane/EtOAc to give a white solid (1.63 g, 56% for two steps). MS: calc'd 444 (MH+), exp 444 (MH+). 1H NMR (400 MHz, CDCl3-d) 9.65 (broad s, 1H), 8.72 (d, 1H, J=2.0 Hz), 8.06 (d, 1H, J=8.4 Hz), 7.53-7.41 (m, 4H), 4.18-4.08 (m, 1H), 3.66-3.54 (m, 2H), 2.45-2.35 (m, 1H), 2.21-2.11 (m, 1H), 1.98-1.87 (m, 1H), 1.83-1.72 (m, 1H).

1. customevaporated
2. dissolutionThe mixture was redissolved in EtOAc (40 mL)
3. washwashed with 2N HCl (20 mL×3), brine, 5% NaHCO3 (20 mL×3), brine
4. dry with materialdried with Na2SO4
5. filtrationfiltered
6. customevaporated
7. customThe residue was purified by column chromatography on silica gel
8. customto give a white solid (1.63 g, 56% for two steps)

ORD record

ord-37abab0d833d4ed6b72a3cd9ac56a8c5

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08202866B2