Abstract
Reported is a one-pot l-proline-catalyzed synthesis of substituted tetrahydro-2H-pyran-3-carboxylate derivatives by the three-component condensation of cinnamaldehyde, anilines and 4,4,4-trifluoroacetoacetate. The reaction proceeds well with non-bulky electron-rich anilines but in lower yields with electron-withdrawing or bulky anilines. The tetrahydropyran derivatives were obtained as racemic mixtures and the stereochemistry was established by X-ray crystallographic analysis on one derivative. A reasonable mechanism as shown was suggested without evidence.
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