N-bromobutanimide → HCID 70912852, compound

Temperature

-78 °C

A solution of N-bromosuccinimide (4.42 g, 24.83 mmol) in THF (62.5 ml) was added dropwise to a stirred solution of 1-(5-(4-chlorophenyl)-1,4-dimethyl-1H-pyrrol-2-yl)propan-1-one (compound 49a, 6.5 g, 24.83 mmol) in THF (100 ml) at −78° C. The resulting reaction mixture was then stirred at a temperature of −78° C. for 5 hr. The reaction mixture was allowed to warm to 25° C. slowly during further 3 to 4 hr. The progress of the reaction was monitored by TLC. The solvent from the reaction mixture was evaporated under reduced pressure and residue so obtained was mixed in ethyl acetate (200 ml). The resulting mixture was washed with saturated sodium bicarbonate solution (1×100 ml) which was followed by washing with water (1×100 ml). The combined organic layer was dried over anhydrous Na2SO4. The solvent was evaporated from the dried organic layer under reduced pressure to obtain a crude product, which was then purified by flash column chromatography using 10% ethyl acetate in hexanes to obtain the title compound (7.58 g, 90%).

1. customThe resulting reaction mixture
2. temperatureto warm to 25° C. slowly during further 3 to 4 hr
3. customThe solvent from the reaction mixture was evaporated under reduced pressure and residue
4. customso obtained
5. washThe resulting mixture was washed with saturated sodium bicarbonate solution (1×100 ml) which
6. washby washing with water (1×100 ml)
7. dry with materialThe combined organic layer was dried over anhydrous Na2SO4
8. customThe solvent was evaporated from the dried organic layer under reduced pressure
9. customto obtain a crude product, which
10. customwas then purified by flash column chromatography

ORD record

ord-e957427af3b0489792896e1542ceaf63

Source dataset

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09393247B2