反应详情

To a solution of [2-(3,5-bis-trifluoromethyl-phenyl)-6-(4-trifluoromethyl-phenyl)-pyridin-4-yl]-acetic acid methyl ester (150 mg, 0.3 mmol) in THF (5 mL) at −78° C. under argon was added potassium bis(trimethylsilyl)amide (0.5 M solution in toluene, 600 μL, 0.3 mmol). After stirring for 30 minutes, 3-bromo-2-methylpropene (40 mg, 0.3 mmol) was added and stirred for an additional 30 minutes. The reaction mixture was allowed to warm up slowly and stirred for another 30 minutes at 0° C. The mixture was then concentrated and purified by column chromatography on silica gel (20-60% methylene chloride in heptane) to give the product as a white solid (85 mg, 51%). 1H NMR (300 MHz, CDCl3) δ 8.56 (s, 2H), 8.23 (d, J=8.29 Hz, 2H), 7.96 (s, 1H), 7.69-7.86 (m, 4H), 4.80 (d, J=19.59 Hz, 2H), 4.01 (dd, J=6.78, 9.04 Hz, 1H), 3.74 (s, 3H), 2.97 (dd, J=9.04, 14.69 Hz, 1H), 2.58 (dd, J=6.78, 14.69 Hz, 1H), 1.79 (s, 3H). MS m/e 562.2 (M+H).

1. stirringstirred for an additional 30 minutes
2. temperatureto warm up slowly
3. stirringstirred for another 30 minutes at 0° C
4. concentrationThe mixture was then concentrated
5. custompurified by column chromatography on silica gel (20-60% methylene chloride in heptane)