Condensation of α-cyanocinnamonitriles with 6-bromo-2-naphthol:: synthesis of pyrano [2,3-d]pyrimidine and pyrano[3,2-e][1,2,4]triazolo[2,3-c]pyrimidine derivatives

Naphthopyrans are synthesized by the reaction of cinnamonitriles with 6-bromo-2-naphthol; polysubstituted naphthopyrimidines and naphthopyranotriazolopyrimidines are also prepared.