K2CO3-Promoted oxy-Michael Addition/Cyclization of α,ß-Unsaturated Carbonyl Compounds with Naphthols: Synthesis of Naphthopyrans.

ABSTRACT

A potassium carbonate promoted tandem oxy-Michael addition/cyclization of α,ß-unsaturated carbonyl compounds with naphthol derivatives for the synthesis of 2-substituted naphthopyrans was developed. Using the readily available, inexpensive potassium carbonate as the promoter, a range of different substituted naphthopyrans were prepared.