phenyl 2-(8-fluoro-6-nitro-3,4-dihydroquinolin-1(2H)-yl)ethyl(methyl)carbamate → phenyl 2-(6-amino-8-fluoro-3,4-dihydroquinolin-1(2H)-yl)ethyl(methyl)carbamate

Participants

Reaction Steps

To a stirred solution of phenyl 2-(8-fluoro-6-nitro-3,4-dihydroquinolin-1(2H)-yl)ethyl(methyl)carbamate (560 mg, 1.500 mmol) was added palladium on activated carbon, 10 wt % (160 mg, 0.150 mmol). The resulting suspension was stirred at room temperature in a balloon pressure atmosphere of hydrogen. After 3 h, most of the starting material was consumed, and the reaction was stopped due to the presence of a minor impurity. The reaction mixture was filtered through a pad of celite, then concentrated to give a brown oil. The residue was dried and use directly in the subsequent reaction. Crude product obtained was phenyl 2-(6-amino-8-fluoro-3,4-dihydroquinolin-1(2H)-yl)ethyl(methyl)carbamate (449 mg, 1.308 mmol, 87% yield). 1 H NMR (DMSO-d6) δ 7.40-7.35 (m, 2H); 7.23-7.17 (m, 1H); 7.10-7.05 (m, 2H); 6.19 (d, J=14 Hz, 1H); 6.06 (s, 1H); 4.85-4.72 (m, 2H); 3.57-3.53 (m, 1H); 3.46-3.42 (m, 1H); 3.13-2.93 (m, 4H); 3.07, 2.95 (2s, 3H); 2.57 (t, J=6.3 Hz, 1H); 1.74-1.65 (m, 2H). ESI-MS (m/z, %): 344 (MH+).

Provenance & Evidence