反应详情

A mixture of 1-(4-fluorophenyl)-2-(thiophen-3-yl)ethanone (Intermediate 54) (100 mg, 0.45 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (87 mg, 0.41 mmol), urea (74 mg, 1.24 mmol), concentrated HCl (0.04 mL, 0.41 mmol) in EtOH (5 mL) was refluxed overnight. Followed standard aqueous/EtOAc workup procedure, then purified by preparative HPLC to give Compound 109 (50 mg, yield 27%). 1H NMR (DMSO-d6 400 MHz): δ 10.30 (s, 1H), 8.77 (s, 1H), 7.58 (s, 1H), 7.49 (s, 1H), 7.34-7.30 (m, 2H), 7.27 (s, 1H), 7.23-7.18 (m, 3H), 6.88 (s, 1H), 6.27 (d, J=5.2 Hz, 1H), 5.21 (d, J=2.8 Hz, 1H), 4.13-4.06 (m, 2H), 1.36 (t, J=6.8 Hz, 3H); MS (ESI): m/z 456.0 [M+1]+.

1. temperaturewas refluxed overnight
2. custompurified by preparative HPLC