Die Glykoside der Blätter von Isoplexis isabelliana (WEBB) MASF.. 3. Mitteilung

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Abstract
The isolation, characterisation and chemical investigation of the cardiac glycosides of the dried leaves of Isoplexis isabelliana (WEBB) MASF. are described. 7 glucosides B, D, E, J (monoside), K, M, and 1 (monoside) could be obtained in homogenous form, 3 others were mixtures (“A” = A1 + A2, “C” = C1 + C2, and “G” = G + K). The substances B (gluco‐evatromonoside), D (cheiroside A), E (digitoxigenin‐glucosido‐6‐deoxyglucoside), J (digitoxigenin glucoside), and M (digitalinum verum) could be identified with known substances. The new glycosides are derived from 3 genins: digitoxigenin, uzarigenin, and xysmalogenin, which are directly bound to one of the following sugars: 6‐deoxyglucose, 2‐O‐acetyl‐6‐deoxy‐D‐glucose, 2,6‐dideoxy‐D‐arabinohexose (= D‐canarose), and 2,6‐dideoxy‐D‐ribohexose (= D‐digitoxose), terminated by a glucose unit. –Canarobiose, a new crystalline disaccharide of D‐glucose and D‐canarose, has also been obtained. –Apart from these cardiac glycosides 3 C21‐steroids have been isolated (in addition to the 2 known genins γ‐digiprogenin and purpnigenin), and their structures elucidated. The presence of 2 sapogenins has been detected.

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