N-bromobutanimide → HCID 57826909, compound

Participants

Reaction Steps

A solution of methyl 4-(1-methyl-1H-pyrazol-5-yl)-5-propyl-2-thiophenecarboxylate (714 mg, 2.70 mmol) and N-bromosuccinimide (481 mg, 2.70 mmol) in tetrahydrofuran (12 ml) was stirred in a sealed tube for 1 h at 70° C. The reaction mixture was divided and half was partitioned between H2O-DCM. The aqueous phase was washed several times with DCM and the combined organic fractions were dried over Na2SO4, concentrated and used directly yielding methyl 4-(4-bromo-1-methyl-1H-pyrazol-5-yl)-5-propyl-2-thiophenecarboxylate (464 mg, 1.35 mmol, 50% yield) as an orange oil: LCMS (ES) m/e 343, 345 (M, M+2)+.

Provenance & Evidence