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Abstract
A remarkably efficient double‐crossed aldol condensation of tetrahydropyran‐4‐one with a variety of aromatic aldehydes is described at room temperature in the presence of (trimethylsilyl)diethylamine and lithium perchlorate under solvent‐free conditions. Excellent yields of 3,5‐bis(arylmethylidene)pyranones are achieved in a facile one‐pot general procedure.
Acknowledgment
Partial financial support by the Ministry of Science, Research, and Technology of Iran is greatly appreciated. B. Mohebali is also acknowledged for conducting NMR experiments.