Abstract
An application of dimethyl urea and L-tartaric acid as deep eutectic solvent (DES) is demonstrated for the synthesis of 2-(methylamino)-3-nitrospiro[chromene] and N-methyl-3-nitro-4H-chromen-2-amines by a reaction of substituted isatins/pyrazole aldehydes, nucleophiles and (E)-N-methyl-1-(methylthio)-2-nitroethenamine. Systematic studies proved that the dimethyl urea and L-tartaric acid in 2:1 ratio at 80 °C is suitable to give the desired products in good yields in shorter period of reaction time (45 min). This method was extended for water as reaction medium and good yields of the products was obtained in 1 h.
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