A new method for the preparation of substituted 5,6,7,8-tetrahydro-4H-I-benzopyran and 4H-pyrans by vilsmeier -haack reagent

Article abstract of DOI:10.1016/S0040-4039(00)79732-2

Substituted 5,6,7,8-tetrahydrO-4H-1-benzopyran and 4H-pyran derivatives were synthesized from their corresponding substituted 1,5 diketones with vilsmeier haack reagent in moderate yields.