反应详情

44 g (167 mmol) of triphenylphosphine were added to a solution of 24 g (152 mmol) of 5-hydroxymethyl-3-methylthiophene-2-carbonitrile in 180 ml of tetrahydrofuran. Then, a solution of 55 g (167 mmol) of tetrabromomethane in 100 ml of tetrahydrofuran was added. The mixture was stirred for 90 minutes at room temperature. The reaction mixture was concentrated on a rotary evaporator under a water pump vacuum, and the residue was purified by column chromatography (eluant hexane:ethyl acetate 8:2). This gave 34 g of the title compound which still contained a small amount of solvent. 1H NMR (270 MHz, DMSO-d6): δ=2.4 (s, 3H), 5.0 (s, 2H), 7.3 (s, 1H).

1. concentrationThe reaction mixture was concentrated on a rotary evaporator under a water pump vacuum
2. customthe residue was purified by column chromatography (eluant hexane:ethyl acetate 8:2)