反应详情

温度

80 °C

According to the procedure of Magnus et. al (Tetrahed. Lett., 34, 23-26 (1993)) a solution of commercially available 1,4-dimethoxy-2-butyne (1.32 g, 11.5 mmol) in nitrogen-degassed ethanol is heated to 80° C. with stirring under a nitrogen atmosphere. Tris(triphenylphosphine)rhodium chloride (64 mg, 0.07 mmol) and a solution of 2,2,2-trifluoro-N-[1-(2-propynyl)-3-butynyl]acetamide (470 mg, 2.32 mmol; prepared from literature procedure: Romero, Arthur G.; Leiby, Jeffrey A PCT Int. Appl. WO 9623760) in nitrogen-degassed ethanol (2 ml) are added in portions over 2 hours. The mixture is stirred under nitrogen at 80° C. for a further 3 hours. The solvent is removed under vacuo and the residue is purified by flash chromatography on silica gel, eluting with hexane/ethyl acetate (2:1)

1. customdegassed ethanol
2. additionare added in portions over 2 hours
3. stirringThe mixture is stirred under nitrogen at 80° C. for a further 3 hours
4. customThe solvent is removed under vacuo
5. customthe residue is purified by flash chromatography on silica gel
6. washeluting with hexane/ethyl acetate (2:1)