Some new 2-(methylthio)-6-oxo-6H-chromeno[3,4-e]pyrazolo[1,5-a]pyrimidine-3-carbonitrile derivatives Having coumarine nucleus were synthesized by novel synthetic rout from 4-chloro 3-carbaldehyde coumarine derivatives and previously prepared 5-amino-3-(methylthio)-1H-pyrazole-4-carbonitrile using methanol as a solvent and catalytic amount of glacial acetic acid. All the synthesised libraries were characterized by IR, NMR and mass spectral analysis.
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