NANO-ZnO AS HETEROGENEOUS CATALYST FOR THREE-COMPONENT ONE-POT SYNTHESIS OF TETRAHYDROBENZO[<i>b</i>]PYRANS IN WATER

Abstract

Nano-ZnO is reported as an extremely efficient heterogeneous catalyst for the synthesis of tetrahydrobenzo[b]pyrans. A three-component one-pot reaction of arylaldehydes, activated methylenes, and 1,3-diketones took place in water to afford the corresponding tetrahydrobenzo[b]pyrans in good to high yields in the presence of nano-ZnO. Furthermore, the catalyst could be reused for several times without any significant loss of its catalytic activity.

Also published in Chemistry of Heterocyclic Compounds, 2012, 48 (9), pp 1307-1313

http://link.springer.com/article/10.1007/s10593-012-1137-5