Structure Revision of Caesalpinistas A and B and Isolation of a New Furanoditerpenoid from the Cotyledons of Caesalpinia decapetala var. japonica |
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| Authors: | Sayuri Kamikawa Emi Ohta Tatsuo Nehira Hisashi Ômura Shinji Ohta |
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| Affiliation: | 1. Graduate School of Biosphere Science, Hiroshima University, 1‐7‐1 Kagamiyama, Higashi‐Hiroshima 739?–?8521, Japan, (fax: +81‐82‐4240758);2. Graduate School of Integrated Arts and Sciences, Hiroshima University, 1‐7‐1 Kagamiyama, Higashi‐Hiroshima 739?–?8521, Japan |
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| Abstract: | A known cassane‐type furanoditerpenoid, caesalpinista B ( 1 ), and a new diterpenoid, deoxycaesaljaponin A ( 2 ), were isolated from the cotyledons of Caesalpinia decapetala var. japonica. The previously reported configurational assignments of 1 and the related diterpenoid caesalpinista A ( 3 ) were revised on the basis of X‐ray crystallography and chemical conversion. The structure of 2 was elucidated by spectroscopic data and chemical conversion into 3 . |
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| Keywords: | Caesalpinia decapetala Deoxycaesaljaponin A Caesalpinistas A and B Cassane diterpenoids |
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