反应详情

To a dry 100 mL three-necked flask under a flow of N2 containing magnesium turnings (0.595 g; 24.50 mmol) in dry THF (10 mL) at reflux, an activating, small amount of 1-bromo-4-[(4-chlorophenyl) ethynyl] benzene (VIId) (0.39 g; 1.33 mmol) was added in one portion. N2 flow and stirring were stopped. Reaction mixture was heated at reflux for 5 minutes then iodine crystal was added keeping vigorous reflux to start the reaction. The reaction mixture went colourless after 5minutes and reaction mixture turned black-blue after an additional minute. A solution of the remaining amount of 1-bromo-4-[(4-chlorophenyl) ethynyl] benzene (VIId) (6.104 g; 20.93 mmol) in dry THF (35 mL) at 55° C. was added drop wise into the reaction mixture while keeping gentle reflux. Reflux was maintained for 15minutes then temperature was allowed to cool to RT under stirring for 1 h. The reaction mixture was cooled to 3° C. and a solution of dry 1-formyl-piperidine (3.71 mL; 33.40 mmol) in dry THF (10 mL) was added drop wise maintaining temperature at 5° C. The reaction mixture was then allowed to warm to RT and it was stirred overnight. Protocol and work-up was then similar with those described above. Purification was performed by flash chromatography (SiO2) using (cyclohexane 9-ethyl acetate 1). The title compound (m=1.02 g) was obtained as a white solid in a19% yield. Melting point: 164° C.

1. temperatureat reflux
2. customReaction mixture
3. temperaturewas heated
4. temperatureat reflux for 5 minutes
5. temperaturekeeping vigorous reflux
6. customthe reaction
7. customreaction mixture
8. temperatureReflux
9. temperaturewas maintained for 15minutes
10. temperatureThe reaction mixture was cooled to 3° C.
11. temperaturewise maintaining temperature at 5° C
12. temperatureto warm to RT
13. stirringit was stirred overnight
14. customPurification