Ethyl bromopyruvate → HCID 59251444, compound

Participants

Reaction Conditions

Reaction Steps

A stirred mixture of 5-bromo-N-(2,6-dichlorophenyl)-thiophene-2-carboxamidine (3.9 g, 11 mmol) and sodium bicarbonate (1.85 g, 22 mmol) in isopropanol (55 mL) was charged with ethyl bromopyruvate (2.5 mL, 20 mmol) and then heated at 95° C. After 17 h the reaction mixture was allowed to cool to ambient temperature, filtered and the solids rinsed with EtOAc. The combined filtrates were concentrated under reduced pressure and purified by chromatography (silica, EtOAc/Hex, 15:85 to 65:35) to give the title compound (3.3 g, 67%) as a tacky yellow solid, which was used in the next step without further purification. 1H-NMR (DCM-d2): δ 7.60 (s, 1H), 7.49-7.59 (m, 3H), 6.89 (d, 1H), 6.56 (d, 1H), 4.37 (q, 2H), 1.38 (t, 3H).

Provenance & Evidence