反应详情

A mixture of 1,2-diphenylethanone (400 mg, 2.04 mmol), 3-ethoxy-4-hydroxy-5-nitrobenzaldehyde (430 mg, 2.04 mmol), and 1-methylurea (454 mg, 6.12 mmol) in anhydrous EtOH was added concentrated HCl (204 mg, 2.04 mmol), and the reaction mixture was refluxed for 3 days. When TLC (EtOAc:MeOH=10:1) showed that the starting materials were consumed, the reaction mixture was concentrated, and purified by preparative HPLC to afford Compound 11 as a yellow solid (138 mg, yield: 15.2%). 1H NMR (DMSO-d6 400 MHz TMS): δ 10.25 (s, 1H), 7.68 (d, J=2.8 Hz, 1H), 7.45 (s, 1H), 7.20-7.28 (m, 3H), 7.15-7.20 (m, 3H), 6.85-6.95 (m, 3H), 6.70 (d, J=6.4 Hz, 1H), 5.00 (d, J=2.4 Hz, 1H), 4.02 (m, 2H), 2.60 (s, 3H), 1.30 (t, J=7.0 Hz, 3H); MS (ESI): m/z 446.2 [M+1]+.

1. temperaturethe reaction mixture was refluxed for 3 days
2. customwere consumed
3. concentrationthe reaction mixture was concentrated
4. custompurified by preparative HPLC