Die vermutliche Struktur der Anodendroside. Glykoside und Aglykone, 331. Mitteilung

Five crystalline compounds (anodendrosides) have been isolated from Anodendron paniculatum ( Roxb .) A. DC . (Apocynaceae). They represent glycosides containing unusual sugars. Tentative structures for anodendroside‐A ( 155 ), −E 1 ( 3 ), −E 2 ( 84 ), −F ( 144 ) and −G ( 115 ) are now presented. These structures are based on UV., IR., but mostly on high resolution mass spectra. NMR.‐spectra could be performed with A, O‐acetyl‐E 2 and O‐acetyl‐G, which are in good agreement with the suggested structures. The unusual methylendioxy group postulated in the sugar moiety of A, E 1 and E 2 was also established by chemical methods, yielding approximately 1 Mol. equiv. of formaldehyde after acid hydrolysis of anodendroside‐E 2 .