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Note | Special issue | Vol 66, No. 1, 2005, pp.651-658
Published online, 15th November, 2005
DOI: 10.3987/COM-05-S(K)63
Two New Indole Alkaloids from Aspidosperma subincanum and Geissospermum vellosii

Haruaki Ishiyama, Miyako Matsumoto, Mitsuhiro Sekiguchi, Hideyuki Shigemori, Ayumi Ohsaki, and Jun’ichi Kobayashi*

*Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Kita-ku, Sapporo, Hokkaido 060-0812, Japan

Abstract

Two new indole alkaloids, subincanadine G (1) and pausperadine A (2), were isolated from the barks of Aspidosperma subincanum Mart and Geissospermum vellosii Allemão, respectively. Subincanadine G (1) has 1-azoniatricyclo[4.3.3.01,5]undecane moiety, while pausperadine A (2) contains an N-oxide moiety. The gross structures and relative stereochemistry of 1 and 2 were elucidated by spectroscopic data.