Studies on the constituents of the seeds of Hernandia ovigera L. VIII. Syntheses of (.+-.)-desoxypodophyllotoxin and (.+-.)-.BETA.-peltatin-A methyl ether.
作者:Tatsuhiko KASHIMA、Mariko TANOGUCHI、Masao ARIMOTO、Hideo YAMAGUCHI
DOI:10.1248/cpb.39.192
日期:——
(±)-Desoxypodophyllotoxin (2), a chief component of the seeds of Hernandia ovigera L., and (±)-β-peltatin-A methyl ether (3), an analogous phenyltetralin lignan, which have 2, 3-trans, 3, 4-cis configuration were synthesized according to the method developed for the synthesis of hernandin (1). The syntheses were pursued using the corresponding 4-phenyl-1, 2-dihydronaphthalene lactones (9 and 10) followed by cleavage of the lactone moiety to give the unsaturated hydroxy acids (11 and 12). Subsequent hydrogenation and ring closure by means of p-toluenesulfonic acid afforded both 2, 3-trans, 3, 4-cis and 2, 3-cis, 3, 4-cis ligans (2 and 13 or 3 and 14), which were isolated by preparative thin layer chromatography.
(±)-去氧鬼臼毒素(2)是Hernandia ovigera L.种子中的主要成分,以及结构类似的苯基四氢萘木脂素(±)-β-peltatin-A甲基醚(3),它们具有2,3-反式,3,4-顺式构型,根据合成Hernandin(1)的方法进行了合成。合成过程采用了相应的4-苯基-1,2-二氢萘内酯(9和10),随后裂解内酯部分得到不饱和的羟基酸(11和12)。接下来的氢化和环化步骤使用对甲苯磺酸,得到了2,3-反式,3,4-顺式和2,3-顺式,3,4-顺式的木脂素(2和13或者3和14),这些产物通过制备薄层色谱法进行了分离。