A simple and efficient synthesis of biscoumarin and dihydropyrano[c]chromene derivatives
using catalytic amounts of imidazole or isoquinoline as organocatalyst under solvent-free conditions is
reported. The present procedure offers advantages such as high to excellent yields, short reaction times,
inexpensive operation, solvent-free conditions, reduced environmental consequences and simple workup.
Keywords: Dihydropyrano[c]chromene, biscoumarin, organocatalyst, imidazole, isoquinoline, multicomponent reaction.
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