Summary.
A clean and efficient method for the synthesis of 4H-pyran derivatives through the one-pot condensation of aromatic aldehydes, malononitriles, and β-dicarbonyl compounds, using guanidine base tetramethylguanidine in [bmim][BF4] ionic liquid as a recyclable catalytic system, was described.
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Peng, Y., Song, G. & Huang, F. Tetramethylguanidine-[bmim][BF4]. An Efficient and Recyclable Catalytic System for One-Pot Synthesis of 4H-Pyrans. Monatshefte für Chemie 136, 727–731 (2005). https://doi.org/10.1007/s00706-004-0270-y
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DOI: https://doi.org/10.1007/s00706-004-0270-y