反应详情

温度

-78 °C

A solution of 3-(2,2-dibromoethenyl)-4-(4-fluorophenyl)-2-(1-methylethyl)-6-phenylpyridine (2.105 gm, 4.43 mmol) in dry THF (23 ml) was cooled to -78° C. and treated with n-BuLi (1.5M in hexane, 5.95 ml, 8.93 mmol) over a 4 minute period. After stirring at -78° C. for 1.25 hours, the deep purple solution was quenched with saturated NH4Cl, warmed to room temperature, diluted with H2O, and extracted 2× with Et2O. The combined Et2O extracts were washed with brine, dried (Na2SO4), filtered and stripped to give a yellow solid. The solid was recrystallized from a minimum amount of hot hexane to afford analytically 3-ethynyl-4-(4-fluorophenyl)-2-(1-methylethyl)-6-phenylpyridine as white needles. The mother liquor was stripped and recrystallized again from hot hexane to give additional product (total yield 1.199 gm, 86%)

1. customthe deep purple solution was quenched with saturated NH4Cl
2. temperaturewarmed to room temperature
3. additiondiluted with H2O
4. extractionextracted 2× with Et2O
5. washThe combined Et2O extracts were washed with brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. customto give a yellow solid
9. customThe solid was recrystallized from a minimum amount of hot hexane