Keywords
barbituric acid
four-component reaction
ionic scaffold.
isatin
malononitrile
morpholine
multicomponent reaction
tandem Knoevenagel–Michael reaction
Abstract
The new type of four-component tandem Knoevenagel-Michael reaction was found: isatins, barbituric acids, malononitrile and morpholine at ambient temperature and without catalysts selectively form new non-symmetrical ionic scaffold, namely, morpholin-4-ium 5-(3-dicyanomethyl-2-oxoindolin-3-yl)-1,3-dimethyl-2,6-dioxo-1,2,3,6-tetra-hydropyrimidin-4-olate derivatives, in 80-98% yields. Their structure was confirmed using 2D NMR such as 1H-1H COSY, 1H-13C HSQC, and 1H-13C HMBC correlation experiments. The products seem promising as they contain three different pharmacologically active heterocyclic rings.
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