反应详情

10% Degussa Pd on carbon (15 mg, 0.14 mmol) was flushed with nitrogen then diluted in ethanol (2 mL). A solution of 4-(4-nitrobenzyl)-2-(trifluoromethyl)pyridine (100 mg, 0.35 mmol) in ethanol (2 mL) and pyridine (14 mg, 0.18 mmol) was subsequently added, and the mixture was flushed again with nitrogen prior to placing a hydrogen balloon on the flask. The mixture was stirred at rt overnight then filtered through Celite® and concentrated. The residue was dissolved in ethyl acetate and filtered through a silica gel plug, eluting with 50-100% ethyl acetate in hexanes, to give 4-(2-trifluoromethyl-pyridin-4-ylmethyl)-phenylamine as a clear colorless oil (76 mg, 85%). 1H NMR (CHCl3-d) δ 8.57 (d, J=5.0 Hz, 1H), 7.47 (s, 1H), 7.26 (m, 1H), 6.93 (m, 2H), 6.65 (m, 2H), 3.92 (s, 2H), 3.57 (br s, 2H).

1. customthe mixture was flushed again with nitrogen
2. filtrationthen filtered through Celite®
3. concentrationconcentrated
4. dissolutionThe residue was dissolved in ethyl acetate
5. filtrationfiltered through a silica gel plug
6. washeluting with 50-100% ethyl acetate in hexanes