反应详情

A stirred solution of methyl 3-(4-fluorophenyl)propiolate (8.02 g, 45 mmol) and 1-aminopyridinium iodide (10 g, 45 mmol) in dry acetonitrile (150 mL) was cooled to about 0° C. A solution of 1,8-diazabicycloundec-7-ene (13.7 g, 90 mmol) in dry acetonitrile (50 mL) was added dropwise over 1 hour. The mixture was allowed to stir at room temperature for about 18 h. The reaction mixture was cooled in an ice bath for about 30 min and the precipitate was collected by filtration and washed with cold acetonitrile (10 mL). The solid was dried under reduced pressure to give the title compound as a white solid, 8.48 g (70%). 1H NMR (CDCl3) δ 8.50 (d, 1H, J=8.4 Hz), 8.18 (d, 1H, J=8.8 Hz), 7.78 (m, 2H), 7.42 (t, 1H, J=8.4 Hz), 7.13 (t, 2H, J=8.8 Hz), 6.97 (td, 1H, J=6.8, 1 Hz). ). MS (+ve ion electrospray) 271 (100), (MH+).

1. temperatureThe reaction mixture was cooled in an ice bath for about 30 min
2. filtrationthe precipitate was collected by filtration
3. washwashed with cold acetonitrile (10 mL)
4. customThe solid was dried under reduced pressure