Synthesis of New 8-Formyl-4-methyl-7-hydroxy Coumarin Derivatives

8-Formyl-4-Methyl-7-Hydroxy Coumarin Derivatives were synthesized via Penchem condensation followed by Duffs reaction. Treatment of this with N,N-di substituted cyano acetamides in the presence of piperdine afforded New 8Formyl- 4-Methyl-7-Hydroxy Coumarin Derivatives (7a-o). Their structures were characterized by IR, H-1 and C-13 NMR and Mass spectral and elemental analysis data.