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Communication | Special issue | Vol 15, No. 1, 1981, pp.241-244
Published online, 1st January, 1970
DOI: 10.3987/S-1981-01-0241
Mallotucin C and D, Two Diterpenic Lactones from Mallotus repandus

Tetsuo Nakatsu , Sho Ito,* and Takeshi Kawashima

*Department of Chemistry, Graduate School of Science, Tohoku University, Aobayama, Sendai 980-8578, Japan

Abstract

Investigation on the constituents of the titled plant collected in June resulted in the isolation of mallotucin B and mallotucins C and D (as acetates). Mallotucin A (≡teucvin), which is the only diterpenic constituent in the plant collected in December, was not detected. Structures of mallotucins C and D were elucidated on the basis of their chemical correlation with mallotucin A and the detailed spectral analyses of their acetates. Mallotucin A is suggested to be biosynthesized from chettaphane-type precursors, mallotucins B, C and/or D.