One-pot three-component synthesis of a new series of tetrahydrobenzofuran-chromone conjugates.

An efficient one-pot three-component protocol for the synthesis of novel tetrahydrobenzofuran-chromone conjugates using 3-formylchromones and 1,3-cyclohexandiones in the presence of a variety of alkyl or aryl isocyanides was developed. The reaction sequence consists of an initial Knoevenagel condensation of aromatic aldehydes with 1,3-cyclohexandione derivatives, followed by a [4 + 1] cycloaddition of with isocyanides, and then imine-enamine tautomerization to afford the products. [ABSTRACT FROM AUTHOR]