Trifluoroacetic acid → N-(2-amino-5-(thiophen-2-yl)phenyl)tetrahydro-2H-pyran-4-carboxamide

Participants

Reaction Steps

To a stirred solution of tert-butyl (2-(tetrahydro-2H-pyran-4-carboxamido)-4-(thiophen-2-yl)phenyl)carbamate in dichloromethane (20 mL) was added trifluoroacetic acid (7 mL) at room temperature. The reaction mixture was stirred at room temperature for 2 h. the solvents were then removed under reduced pressure. A saturated aqueous solution of sodium bicarbonate was added. The product was extracted with EtOAc, washed with water and brine, dried, filtered and concentrated under reduced pressure. The crude product was purified by column chromatography (silica gel, MeOH/CH2Cl2) to afford N-(2-amino-5-(thiophen-2-yl)phenyl)tetrahydro-2H-pyran-4-carboxamide as a beige solid (1.1 g, 86% yield). ESI+ MS: m/z 303 ([M+H]+), 1H NMR (500 MHz, d6-DMSO): δ 9.12 (s, 1H), 7.51 (d, J=2.0 Hz, 1H), 7.34 (d, J=5.0 Hz, 1H), 7.24-7.18 (m, 2H), 7.03 (dd, J=5.5; 3.5 Hz, 1H), 6.75 (d, J=8.5 Hz, 1H), 5.05 (s, 1H), 3.91 (dd, J=11.0; 2.0 Hz, 2H), 3.36 (dt, J=11.0; 2.0 Hz, 2H), 2.68-2.62 (m, 1H), 1.80-1.64 (m, 4H).

Provenance & Evidence