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