Synthesis of New 2-Substituted 4-(2-Furyl)-4H-pyrans
Substituted 2-amino-3-cyano-4 H -pyrans represent important precursors in syntheses of condensed heterocycles containing a 4 H -pyran nucleus. In the context of studies of reactivity of 2-amino-5-acetyl-4-(5-X-2-furyl)-3-cyano-6-methyl-4 H -pyrans we were interested in the possibility of preparing 2-aryl(heteroaryl)methyleneamino-4 H -pyrans III .