Ceria-Vanadia/Silica-Catalyzed Cascade for C-C and C-O Bond Activation: Green One-Pot Synthesis of 2-Amino-3-cyano-4H-pyrans.
We designed a ceria-vanadia/silica (Ce-V/SiO2) heterogeneous catalyst and used it for the green and efficient synthesis of 2-amino-3-cyano-4H-pyran derivatives. The green reaction was a multicomponent one-pot condensation of 5,5-dimethylcyclohexane-1,3-dione, aromatic aldehyde, and malononitrile in an eco-compatible solvent (ethanol). The catalyst was synthesized and fully characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. The reported procedure offers a number of advantages including decreased reaction times, mild conditions, high yields, operational simplicity, and environmentally benign and simple work-up procedures. Furthermore, the catalyst is economical, fully recyclable, and reusable for over five runs while preserving its high activity. The synthesized 2-amino-3-cyano-4H-pyran products can later be used for pharmaceutical purposes.
School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa.
Surya Narayana
SN
Maddila
School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa.
Suresh
S
Maddila
School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa.
Werner E
WE
van Zyl
School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa.
Sreekantha B
SB
Jonnalagadda
4H-pyrans; ceria–vandia/silica (Ce–V/SiO2); green chemistry; heterogeneous catalysts; one-pot multicomponent reactions; recyclable