3-b]chromenone derivatives were synthesized successfully via a pseudo three-component reaction of salicylaldehyde derivatives with 4-hydroxycoumarin in a ratio of 1:2 respectively in aqueousmedia catalyzed by diammonium hydrogen phosphate (DAHP) or S-proline at room temperature. This later modified by a solvent-free approach without catalyst at 80°C. These are the first reports on the synthesis of dihydrochromeno[4
Divergent Products Obtained from the Reactions of Salicylaldehyde and 4-Hydroxycoumarin in TEBAC-H<sub>2</sub>O, KF-Al<sub>2</sub>O<sub>3</sub>-EtOH, and Ionic Liquid
作者:Xiang-Shan Wang、Jie Zhou、Ke Yang、Mei-Mei Zhang
DOI:10.1080/00397910903419837
日期:2010.10.20
Controlling selectivity of the reactions of salicylaldehydes and 4-hydroxycoumarin in triethylbenzylammonium chloride-H2O, ionic liquid, or KF-Al2O3-EtOH systems, respectively, resulted in the syntheses of three series of different coumarin derivatives.