反应详情

To a solution of 4-hydroxy-benzoic acid hydrazide (0.3 g, 0.002 mol) and 4,5-dimethyl-2-furaldehyde (0.25 g, 0.002 mol) in abs. EtOH (10 mL), was added 1 drop of acetic acid. The reaction mixture was refluxed for 5 hours. The reaction mixture was cooling to room temperature and concentrated to remove solvent. The resulting residue was solidified by EtOAc to give red solid 0.47 g, in 90% yield, mp: 251.4° C. 1H NMR (DMSO-d6) δ 11.46 (s, 1H), 10.09 (s, 1H), 8.18 (s, 1H), 7.79 (d, 2H), 6.86 (d, 2H), 6.69 (s, 1H), 2.27 (s, 3H), 1.96 (s, 3H). 13C NMR (DMSO-d6) δ 163.1, 161.0, 150.3, 147.2, 137.0, 130.0, 124.4, 117.4, 116.9, 115.4, 11.8, 9.9. Anal. Calcd for C14H14N2O3 H2O: C, 60.82; H, 5.11; N, 10.13. Found: C, 60.80; H, 5.03; N, 9.48.

1. temperatureThe reaction mixture was refluxed for 5 hours
2. concentrationconcentrated
3. customto remove solvent