Two novel triterpenoid saponins, phelasin A (1) and phelasin B (2), were isolated from the bark of Anthocephalus cadamba (Roxb) Miq. The structures were established by one-and two-dimensional 1 H and 13 C NMR spectroscopy. The aglycone of 1, phelasingenin (3), is a new compound characterized as 3ˇ-h
Structure elucidation of a mixture of two novel isomeric sesquiterpenoids
✍ Scribed by Philip J. Cox; Andrew A. Freer; Christopher J. Gilmore; George A. Sim; Werner Herz; Ramaswamy Murari
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- French
- Weight
- 98 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
In a search for biologically active natural products, several new metabolites have been isolated from Eupatorlum anomalum Nash.
X-ray diffraction and spectroscopic investigations
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## Abstract The molecular structures of two byproducts 1,1″‐diphenyl‐3′,4′‐dihydrodispiro[indole‐2,2′‐furan‐5′,2″‐indole]‐3,3″(1__H__, 1″__H__)‐dione (3) and 1,5′‐diphenyl‐4′,5′‐dihydro‐3′__H__‐spiro[indole‐2,2′‐pyrano[3,2‐__b__]indol]‐3(1__H__)‐one (4), which accompanied the rearrangement of 3‐hyd