Acer nicoense

Open chain diarylheptanoids were isolated from Acer nicoense (Aceraceae), from Alnus and Betula species Betulaceae), from Alpinia, Curcuma and Zingiber species belonging to the family of gingers Zingiberaceae) and finally from certain Cenirolobium species (Leguminosae). Individual compounds will be classified according to the plant families in which they occur. 

From the stem bark of Acer nicoense Maxim, indigeneous in Japan, Nagai and his coworkers isolated two new glycosides of already known (-)-centrolobol (2) (5) i.e. aceroside VII (3) and aceroside VII (4) (6) . 

Among leguminous Centrolobium species diarylheptanoids were first isolated from C. robustum in 1964 (5). It contains (-)-(R)-centrolobol (2), found later in several other plants too (Acer nicoense (Aceraceae) (6), Be tula pendula (Betulaceae) (24)) as well as two cyclic components, (3/ ,75)-centrolobin (67) and (3/ ,75)-de-0-methylcentrolobin (68) (47). First... 

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