Water → Methyl 5-bromo-1H-pyrrole-3-carboxylate

A solution (30 mL) of methyl 1H-pyrrole-3-carboxylate (3.06 g) in tetrahydrofuran was cooled to −78° C., N-bromosuccinimide (4.38 g) and then pyridine (3 drops) were added, and the mixture was stirred at the same temperature for 1 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated aqueous sodium hydrogencarbonate solution, water and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=5:1) to give the title compound as a pale-yellow solid (yield 3.08 g, 62%).

1. extractionthe mixture was extracted with ethyl acetate
2. washThe extract was washed with saturated aqueous sodium hydrogencarbonate solution, water and saturated brine
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (eluent:hexane-ethyl acetate=5:1)

ORD record

ord-a605f4a637a247d0b92d55a34e5c85f7

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08338461B2