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Abstract
From Glochidion zeylanicum, two megastigmane glucosides, 3- and 9- O-β- d-glucopyranosides of (3 S,5 R,6 R,7 E,9 S)-megastigman-7-ene-3,5,6,9-tetrol ( 1 and 2, respectively), were isolated. Their structures were different from those of kiwiionoside ( 3) and actinidioionoside ( 4), isolated from Actinidia chinensis and Actinidia polygama, respectively, in the stereochemistry at the 9-positions. Alangionosides E ( 5) and O ( 6), isolated from the leaves of Alangium premnifolium, are also megastigmane glucosides, and the latter is closely related to 1 and actinidioionoside ( 4). However, the absolute configurations of the 9-position remained to be determined. They were analyzed to be R by means of a modified Mosher's method. Alangionoside E ( 5) is identical with corchoionoside A in all aspects. The name of corchoionoside A must be retained thereafter.
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