Abstract

New chromene derivatives, 9 H -furo[2,3- f ]chromene-7,8-dicarboxylates, have been synthesized in high yields by a three-component reaction of euparin (isolated from Petasites hybridus), an aldehyde, and dialkyl acetylenedicarboxylate in the presence of PPh 3 and catalytic amount of ZnO nanorods under solvent-free conditions at room temperature. ZnO nanorods showed a strong effect on improving the yield of the desired products. Chromene derivatives can be easily separated from the reaction mixture in a simple work-up, and the catalyst may be recovered and reused without considerable loss of activity.

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