Cephalocyclidin A, a novel pentacyclic alkaloid from Cephalotaxus harringtonia var. nana |
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Authors: | Kobayashi Jun'ichi Yoshinaga Miwa Yoshida Naotoshi Shiro Motoo Morita Hiroshi |
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Affiliation: | Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan. jkobay@pharm.hokudai.ac.jp |
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Abstract: | A novel alkaloid with an unprecedented fused-pentacyclic skeleton and six-consecutive asymmetric centers, cephalocyclidin A (1), has been isolated from the fruits of Cephalotaxus harringtonia var. nana, and the structure was elucidated on the basis of spectroscopic data. The relative and absolute stereochemistry of 1 was determined by a combination of NOESY correlations, X-ray crystallographic data, and the exciton chirality method. |
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