Synthesis and reactions of some 4h-Pyrans using new Natural Catalyst

In ethanolic medium and in the presence of the basalt and gabbro as new naturally reusable heterogeneous catalysts, an easy and efficient one-pot multicomponent protocol, 6-amino-5-cyano-4H-pyrans 1 were synthesized. Also, we report here that compounds 1 are useful and easily available as starting materials for the preparation of functionalized azines in a series of ring transformation in which the amino group furnishes the required nitrogen rings. Structures of the all isolated products 1 - 22 were established based on their elemental and spectroscopic analysis.