Collect. Czech. Chem. Commun. 1992, 57, 1570-1574

Nitriles in Heterocyclic Synthesis: A New Synthesis of Some 4H-Naphthopyrans, 2H-Benzothiopyrans and Their Fused Derivatives

Abdel-Fattah A. Harba, Awatef M. El-Maghrabya and Saoud A. Metwallyb

a Faculty of Science, Qena, A. R. Egypt
b Faculty of Science, Assiut University, Assiut, A. R. Egypt


α,β-Unsaturated nitriles are versatile reagents and their chemistry has received considerable attention. The reactivity of cinnamonitriles I toward active methylene reagents has been extensively utilised for synthesis of pyranes.