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
Facile one‐pot three‐component route to an assembly of
<scp>
2‐amino‐4
<i>H</i>
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‐chromenes and spirochromenes promoted via ceria nanoparticles in a benign manner
In this study, a series of 2-amino-4H-chromenes and spirochromenes were elaborated and synthesized via a new sustainable one-pot three-component strategy from easily available materials including phloroglucinol, malononitrile, and aldehydes/isatins. Ceria nanoparticles (CeO2 NPs) were successfully applied as an effective catalyst that recycled and reused with a marginal decrement in its catalytic performance