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Roxbin B is Cuspinin: Structural Revision and Total Synthesis

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journal contribution
posted on 07.06.2013, 00:00 by Sayuri Yamaguchi, Tsukasa Hirokane, Takashi Yoshida, Takashi Tanaka, Tsutomu Hatano, Hideyuki Ito, Gen-ichiro Nonaka, Hidetoshi Yamada
Prompted by the outcome that the synthesized roxbin B was not identical to the natural roxbin B, the structural determination process and spectral data were re-examined, with the finding that roxbin B was very likely to be 1-O-galloyl-2,3-(R);4,6-(S)-bis-O-hexahydroxydiphenoyl-β-d-glucose (cuspinin). Because the (R)-axial chirality is rare in natural products when the hexahydroxydiphenoyl group bridges the 2- and 3-oxygens, the proposed structure of cuspinin was confirmed by the total synthesis, leading to the conclusion that roxbin B is the same as cuspinin.

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