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E-mail: jgjun@hallym.ac.krReceived November 23, 2010, Accepted January 4, 2011Key Words : Licochalcone E, Claisen-Schmidt condensation, Water-accelerated [3,3]-sigmatropic rearrange-ment, Claisen rearrangement, Co-solvent system Retrochalcones (licochalcones A-E, echinatin) were iso-lated and characterized from the roots of oriental herb, G.inflata.

Highly Efficient Synthesis of Licochalcone E through Water-Accelerated [3,3]-Sigmatropic Rearrangement of Allyl Aryl Ether