反应详情

温度

0 °C

To a solution of 4-(2-methyl-1,3-thiazol-4-yl)-2-oxo-2H-chromene-7-carbaldehyde (0.200 g, 0.74 mmol) and 2-(5-amino-1,3,4-oxadiazol-2-yl)-1,1,1-trifluorobutan-2-ol (0.202 g, 0.96 mmol) in toluene (2 ml) was added PPTS (0.019 g, 0.07 mmol). The reaction mixture was heated under reflux with a Dean-Stark trap for 6 h. After evaporation, the residue was diluted in EtOH (2 ml), cooled to 0° C. and sodium borohydride (28 mg, 0.74 mmol) was added. After 15 min, the reaction was quenched with a saturated solution of NH4Cl, extract with EtOAc then washed with water and brine. The solvent was evaporated and the residue chromatographed on silica gel (chloroform-ethanol, 95:5) to give the title compound. 1H NMR (400 MHz, acetone-d6): δ 8.27 (d, 1H), 8.09 (s, 1H), 7.45 (m, 3H), 6.66 (s, 1H), 6.08 (s, 1H), 4.7 (d, 2H), 2.83 (s, 3H), 2.22 (m, 1H), 2.10 (m, 1H), 0.98 (m, 3H).

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux with a Dean-Stark trap for 6 h
3. customAfter evaporation
4. additionthe residue was diluted in EtOH (2 ml)
5. customthe reaction was quenched with a saturated solution of NH4Cl
6. extractionextract with EtOAc
7. washthen washed with water and brine
8. customThe solvent was evaporated
9. customthe residue chromatographed on silica gel (chloroform-ethanol, 95:5)