反应详情

To a solution of the product prepared in Step 1 (440 mg, 1.24 mmol) in methanol (13 mL) containing a drop of water, was added powdered LiOH (36 mg, 1.5 mmol) and the mixture was stirred at rt overnight. The mixture was concentrated to remove the methanol, diluted in dichloromethane, and washed with water. The combined organic extracts were dried over sodium sulfate, concentrated in vacuo, and purified by column chromatography eluting with 10-25% ethyl acetate in hexanes to give 4-(4-nitrobenzyl)-2-(trifluoromethyl)pyridine as a light yellow solid (100 mg, 29%). 1H NMR (CHCl3-d) δ 8.65 (d, J=4.7 Hz, 1H), 8.21 (m, 2H), 7.49 (s, 1H), 7.35 (m, 2H), 7.28 (m, 1H), 4.18 (s, 2H).

1. concentrationThe mixture was concentrated
2. customto remove the methanol
3. additiondiluted in dichloromethane
4. washwashed with water
5. dry with materialThe combined organic extracts were dried over sodium sulfate
6. concentrationconcentrated in vacuo
7. custompurified by column chromatography
8. washeluting with 10-25% ethyl acetate in hexanes