An amino acid@isopolyoxometalate nanoparticles catalyst containing aspartic acid and octamolybdate for the synthesis of functionalized spirochromenes

Majid Momahed Heravi, , Masoud Mirzaei, & Morteza Tahmasebi
Amino acid polyoxometalate nanoparticles-embedded microcapsules were in situ fabricated by layer-by-layer (LbL) self-assembly method [isopolyoxometalate, Mo8O26·nH2O; amino acid, aspartic acid (AFO)]. Aspartate functionalized γ-octamolybdate (AFO) [Co2(C4H6NO4)2(Mo8O26)(H2O)10]·4H2Owas employed as heterogeneous catalyst for efficient, diverse, and high yielding synthesis of spirochromenes via a three-component reaction involving isatins or acenaphthenequinone, malononitrile or ethyl cyanoacetate, and various 1,3-diketones (dimedone, barbituric acid, or ethyl acetoacetate) or 4-hydroxycoumarin/3-methyl-1H-pyrazol-5(4H)-one in water/ethanol under reflux. The AFO is characterized by some physico-chemical approaches such...
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