64 Daphne genkwaより得られる新ビフラボノイド類の構造(ポスター発表の部)

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In the course of our study of the phenolic compornents of Thymelaeaceous plants, three new spirobiflavonoids, genkwanol A(1), B(2), C(3) were isolated from the barks and the roots of Daphne genkwa SIEB. et Zucc. together with several known compounds. The structure of 1 including absolute configuration was elucidated by chemical transformation of 1 into daphnodorin B(5) and by comparison of spectral data with daphnodorin C(4). The plane structure of 2 was determined on the basis of the extensive spectroscopic analysis and the chemical studies. The absolute configuration of 2 was elucidated to be 2(R), 3(S), 8(S), 2"(S) and 3"(R) by analysis of NOESY of a hexamethyl ether of 2(10) and by modified Mosher's method followed by x-ray analysis of 9. The compound 3 was decided to be stereoisomer of 2 by comparison of spectral data with 2. The absolute configuration of 3 was determined to be 2(R), 3(S), 8(R), 2"(R) and 3"(S) by analysis of NOESY of a hexamethyl ether of 3(19) and by comparison of CD spectrum with 2.
天然有機化合物討論会の論文
1992-09-10

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