反应详情

Bromine (0.47 mL, 9.12 mmol) was added to a solution of imidazole (617 mg, 9.06 mmol) and triphenylphosphine (2.40 g, 9.15 mmol) in CH2Cl2 (30 mL) at room temperature. A solution of methyl 5-hydroxymethyl-thiophene-2-carboxylate (prepared according to the procedures described in WO2004/037808; 1.30 g, 7.59 mmol) in CH2Cl2 (10 mL) was then added. After 10 min at room temperature, the reaction mixture was concentrated in vacuo. Purification of the crude residue by flash column chromatography on 80 g of silica gel (hexane→EtOAc, gradient) afforded 1.70 g (95%) of the title compound (B).

1. concentrationthe reaction mixture was concentrated in vacuo
2. customPurification of the crude residue by flash column chromatography on 80 g of silica gel (hexane→EtOAc, gradient)