Acceleration of the DABCO-promoted Baylis–Hillman reaction using a recoverable H-bonding organocatalyst

It has been shown that catalytic amounts (20–40 mol %) of bis-aryl (thio)ureas greatly accelerate the DABCO-promoted Baylis–Hillman reaction between a range of aromatic aldehydes and methyl acrylate in the absence of solvent. These robust organocatalysts are superior mole per mole promoters of the reaction than either methanol or water and are recoverable in high yield after the reaction by column chromatography.