1968 年 88 巻 11 号 p. 1467-1471
Coumarin (1) and coumaric acid glucoside (2) were isolated from the leaves of Prunus yedoensis MATSUM. (cherry tree). The structure of (2) was proved as o-coumaric acid β-D-glucoside which had been isolated from Melilotus altissima TEUIL. and named melilotoside by C. Charaux. Comparative determination of (1) and (2) in the leaves of cherry tree was made, and it was thereby found that red leaves in autumn contained much more o-coumaric acid glucoside than green leaves in spring, with a very small amount of coumarin in free state throughout the year. It is noteworthy that the deeper the red color of the leaves, the higher the content of o-coumaric acid glucoside. It is also interesting from biosynthetic point of view that both coumarin and anthocyan are synthesized through shikimic acid pathway. It was suggested that the leaves of cherry tree contain a fairly high amount of coumarin in the form of o-coumaric acid glucoside with a very small amount of free coumarin, although Kosuge, Brown, and Soine, have reported that o-coumaric acid glucoside in Melilotus spp. is finally converted into free coumarin.