Piperidine → HCID 69516430, compound

Participants

Reaction Steps

A mixture of 4-carboxybenzaldehyde (2.07 g, 13.81 mmol), ethyl 5-(4-fluorophenyl)-3-oxopentanoate (3.29 g, 13.81 mmol) and piperidine (0.25 mL, 2.53 mmol) in benzene (60 mL) was heated at reflux overnight under Dean-Stark conditions. The reaction mixture was concentrated and the crude material was dissolved in EtOAc. The EtOAc solution was washed with 0.1 M HCl and brine and then dried, filtered, and concentrated. Recrystallization of the resulting material from EtOAc/hexanes produced the title compound as a yellow solid (1.3 g, 3.51 mmol, 25%): 1H NMR (400 MHz, CDCl3) δ 8.09 (d, 2H, J=8), 7.98 (d, 2H, J=8), 7.70 (s, 1H), 7.60 (s, 1H), 7.49 (d, 2H, J=8), 7.32 (d, 2H, J=8), 7.16 (dd, 2H, J=8, 6), 7.07 (dd, 2H, J=8, 6), 6.97 (t, 2H, J˜9), 6.91 (t, 2H, J˜9), 4.29 (q, 2H, J=7), 4.27 (q, 2H, J=7), 3.03 (m, 2H), 2.99 (m, 2H), 2.90 (m, 2H), 2.84 (m, 2H), 1.29 (t, 3H, J=7), 1.23 (t, 3H, J=7) ppm (carboxyl proton not found).

Provenance & Evidence