Keywords
N-bromosuccinimide
4-hydroxy-6-methyl-2H-pyran-2-one
barbituric acids
benzaldehydes
Cyclization
multicomponent reactions
tandem Knoevenagel--Michael reaction
Abstract
The new multicomponent one-pot tandem Knoevenagel–Michael reaction between aromatic aldehydes, N,N'-dimethylbarbituric acid, and 4-hydroxy-6-methyl-2H-pyran-2-one proceeds in alcohols at ambient temperature to selectively afford new substituted unsymmetrical spiro-[furo[3,2-c]pyran-2,5'-pyrimidine] derivatives with two different heterocyclic rings. The procedure involves available non-expensive reactants, mild and convenient conditions, does not require chromatographic isolation and provides excellent yields. The compounds thus obtained are promising for different biomedical applications.
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