Studies on the Constituents of Aceraceae Plants. XIII. Diarylheptanoids and Other Phenolics from Acer nikoense

Abstract

From a mixture of the bark and twigs of Acer nikoense MAXIM. (Aceraceae), nine compounds (1-9) were newly isolated. Compound 1 was identical with acerogenin E, and compounds 8 and 9 were β-orcinol derivatives. Acerogenin K (2), a new diarylheptanoid of the cyclic diphenyl type, yielded acerogenin E on oxidation. Acerogenins F (3) through L (7) are new diarylheptanoids of the cyclic biphenyl ether type, whose skeletons and substituents of the diphenyl ether moieties are the same as those of acerogenin A. Their structures were elucidated on the basis of chemical and spectroscopic evidence.