反应详情

To a mixture of 3-ethoxy-5-formyl-2-hydroxybenzoic acid (Intermediate 37) (130 mg, 0.60 mmol), 1,2-diphenylethanone (150 mg, 0.76), and urea (80 mg, 1.3 mmol) in anhydrous EtOH (5 mL) was added concentrated HCl solution (0.2 mL), the reaction mixture was refluxed overnight. TLC (EtOAc:MeOH=10:1) showed about 50% of the starting materials were consumed. The reaction mixture was concentrated, and purified by column chromatograph (EtOAc:MeOH=40:1) and preparative HPLC to afford Compound 77 as a yellow solid (15 mg, yield: 5.6%). 1H NMR (DMSO-d6 400 MHz): δ 11.37 (s, 1H), 8.66 (s, 1H), 7.47 (s, 1H), 7.43 (d, J=2.0 Hz, 1H), 7.25-7.27 (m, 3H), 7.21-7.25 (m, 2H), 7.14 (d, J=2.0 Hz, 1H), 6.97-7.05 (m, 3H), 6.81 (d, J=2.4 Hz, 2H), 5.10 (d, J=2.8 Hz, 1H), 3.97-4.02 (m, 2H), 1.31 (t, J=6.8 Hz, 3H); MS (ESI): m/z 431.1 [M+1]+.

1. temperaturethe reaction mixture was refluxed overnight
2. customwere consumed
3. concentrationThe reaction mixture was concentrated
4. custompurified by column chromatograph (EtOAc:MeOH=40:1) and preparative HPLC