HEARTWOOD CONSTITUENTS OF BETULA-MAXIMOWICZIANA

In addition to two lignans, (-)-(7R, 8S,8'S)-lyoniresiol (3) and (-)-( 7R,8S)-dihydrodehydrodiconiferyl alcohol (4) in their racemic forms, r espectively, a biphenyl-type diarylheptanoid (-)-(a double dagger S, 3 '' S, 5 '' S)-alnusdiol (1) and a diphenyl ether type diarylheptanoid [(-)-rel-(p R, 3S, 5S)-3',4 poxy-1-(4-hydroxyphenyl)-7-phenylheptane- 3,5-diol] named as (-)-rel-(pR, 3S, 5S)-maximowicziol A (2) were isola ted from the heartwood of Betula maximowicziana. The absolute configur ation of 1 and the relative configuration of 2 are presented on the ba sis of X-ray and CD analyses for the first time. (C) 1997 Elsevier Sci ence Ltd.