Phytochemistry p. 391 - 398 (1984)
Update date:2022-08-02
Topics:
Pandey, Umesh C.
Singhal, Ashok K.
Barua, Nabin C.
Sharma, R. P.
Baruah, Jogendra N.
et al.
Extraction of Conyza japonica gave strictic acid, ent-2β-hydroxy-15,16-epoxy-3,13(16),14-clerodatrien-18-oic acid and 5,7-dihydroxy-3,8,4'-trimethoxyflavone.Extraction of Grangea maderaspatana gave (-)-hardwickiic acid, ent-15,16-epoxy-1,3,13(16),14-clerodatetraen-18-oic acid and 3-hydroxy-8-acetoxypentadeca-1,9,14-trien-4,6-diyne.The structure of ent-2β-hydroxy-15,16-epoxy-3,13(16),14-clerodatrien-18-oic acid was deduced by spectroscopic methods and by partial synthesis from (-)-hardwickiic acid and the stereochemistries of strictic acid and ent-15,16-epoxy-1,3,13(16),14-clerodatetraen-18-oic acid were established by correlation with ent-2β-hydroxy-15,16-epoxy-3,13(16),14-clerodatrien-18-oic acid. - Keywords: Conyza japonica; Grangea maderaspatana; Compositae; Astereae; strictic acid; clerodanes; 5,7-dihydroxy-3,8,4'-trimethoxyflavone; 3-hydroxy-8-acetoxy-pentadeca-1,9,14-trien-4,6-diyne.
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