521-44-8Relevant articles and documents
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Pangarova,Zapesochnaya
, (1975)
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STEREOCHEMISTRY OF STRICTIC ACID AND RELATED FURANODITERPENES FROM CONYZA JAPONICA AND GRANGEA MADERASPATANA
Pandey, Umesh C.,Singhal, Ashok K.,Barua, Nabin C.,Sharma, R. P.,Baruah, Jogendra N.,et al.
, p. 391 - 398 (2007/10/02)
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.