N-bromobutanimide → Ethyl 5-bromo-4-methyl-1H-pyrrole-3-carboxylate

Temperatur

-30 °C

To a solution of ethyl 4-methyl-3-pyrrolecarboxylate (1.57 g, 10 mmol) in anhyd THF (30 mL) cooled to −78° C. was added NBS (1.9 g, 10 mmol). After stirring 1 h at −30° C., the reaction mixture was concentrated under reduced pressure. The residue was purified by column chromatography, eluting with EtOAc-Hex (0:100 to 30:70), to yield ethyl 5-bromo-4-methyl-1H-pyrrole-3-carboxylate (2.0, 86%) as a white solid. 1H-NMR (CDCl3): δ 8.54 (1H, brs), 7.38 (1H, d), 4.27 (2H, q), 2.24 (3H, s), 1.33 (3H, t). To a solution of ethyl 5-bromo-4-methyl-1H-pyrrole-3-carboxylate (2.0 g, 8.6 mmol) in anhyd DMF (30 mL) at 0° C. was added portionwise NaH (60% in mineral oil, 705 mg, 17.6 mmol) under nitrogen. After 1 h at ambient temperature, the reaction mixture was charged with iodomethane (1.5 mL, 24 mmol) and then stirred at ambient temperature overnight. The reaction mixture was quenched by cautious addition of water and then extracted with DCM. The combined extracts were washed with water, dried over Na2SO4, concentrated under reduced pressure, and purified by column chromatography, eluting with EtOAc-Hex (0:100 to 20:80), to provide the title compound (1.64 g, 78%) as a white solid. 1H-NMR (CDCl3): δ 7.33 (1H, s), 4.25 (2H, q), 3.58 (3H, s), 2.24 (3H, s), 1.33 (3H, t).

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. customThe residue was purified by column chromatography
3. washeluting with EtOAc-Hex (0:100 to 30:70)

ORD-Eintrag

ord-b68f350f34e745e5b0879c2f75328e1d

Quelldatensatz

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08367667B2