Efficient and Green Preparation of 2-Amino-4H-chromenes by a Room-Temperature, Na<sub>2</sub>CO<sub>3</sub>-Catalyzed, Three-Component Reaction of Malononitrile, Benzaldehydes, and Phloroglucinol or Resorcinol in Aqueous Medium
作者:Ishmael B. Masesane、Shetonde O. Mihigo
DOI:10.1080/00397911.2015.1031249
日期:2015.7.3
Abstract The preparation of substituted 2-amino-4H-chromenes by a Na2CO3-catalyzed reaction of malononitrile, benzaldehydes, and phloroglucinol or resorcinol in aqueous medium and at room temperature is reported. The merits of this procedure include limited use of organic solvents, easy workup technique, and high purity of products. The 2-amino-4H-chromenes were prepared in yields of 54–96%. GRAPHICAL
Synthesis of
<scp>2‐amino‐4</scp>
<i>H</i>
‐chromenes and spirochromenes using basic ionic liquid, 2‐hydroxyethylammonium formate as green, stable, and reusable catalyst
2-amino-4H-chromenes and spirochromenes were fabricated in a one-pot three-component synthesis manner from commercially available chemicals including phloroglucinol, malononitrile, and aldehydes/isatines with acceptable and easy efficiencies. This methodology was performed in the presence of 2-hydroxyethylammonium formate as an effective and reusableionicliquidcatalyst. Water was selected as the