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Communication | Special issue | Vol 95, No. 1, 2017, pp.131-136
Published online, 27th October, 2016
DOI: 10.3987/COM-16-S(S)6
Total Synthesis of Oenothein C

Hitoshi Abe,* Daichi Ogura, and Yoshikazu Horino

*Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan

Abstract

The simple total synthesis of oenothein C (1), ellagitannin, originally isolated from the leaves of Oenothera erythrosepala, was achieved by successive esterification of the glucose derivative with the protected valoneic acid dilactone (2) and gallic acid (3). The lactonized valoneic acid (11), which is the key structural part, was prepared by the intermolecular Ullmann cross coupling reaction.