反应详情

To a solution of methyl 4-[2-(4′-nitro-1,1′-biphenyl-4-yl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate (1.24 g, 3.25 mmol) in 85% ethanol (50 mL) was added iron powder (1.81 g), followed by 2 N aqueous HCl (1.62 mL), and the resulting mixture was refluxed for 2.5 h. The mixture was then filtered through a pad of Celite® and the filtrate was extracted with dichloromethane. The combined organic phases were then dried over anhydrous sodium sulfate and concentrated in vacuo to afford methyl 4-[2-(4′-amino-1,1′-biphenyl-4-yl)-2-oxoethyl]tetrahydro-2H-pyran-4-carboxylate (1.05 g, 910%). LC-MS ret. time 2.20; m/z 354.0 (MH+); 1H NMR (300 MHz, CDCl3) δ 1.57-1.66 (m, 2H), 2.09 (m, 2H), 3.28 (s, 2H), 3.61 (s, 3H), 3.64-3.71 (m, 4H), 6.76 (d, 2H), 7.42 (d, 2H), 7.54 (d, 2H), 7.88 (d, 2H).

1. temperaturethe resulting mixture was refluxed for 2.5 h
2. filtrationThe mixture was then filtered through a pad of Celite®
3. extractionthe filtrate was extracted with dichloromethane
4. dry with materialThe combined organic phases were then dried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo