Total Syntheses of (+)-Altholactone [(+)-Goniothalenol] and Three Stereocongeners and Their Cytotoxicity against Several Tumor Cell Lines
作者:Yoshihide Ueno、Kin-ichi Tadano、Seiichiro Ogawa、Jerry L. McLaughlin、Ahmad Alkofahi
DOI:10.1246/bcsj.62.2328
日期:1989.7
1,3-benzylidene acetals 8 and 8′ with silica gel. Simultaneous stereochemical inversion at C-4 and C-5 of the major cyclization product, O,O′-benzylidene derivative of (2S,3R,4S,5S)-2-(hydroxymethyl)-5-phenyltetrahydrofuran-3,4-diol (11), to the 2S,3R,4R,5R diastereomer 10 was achieved by hydroboration of (2S,3S)-3-hydroxy-2-(hydroxymethyl)-5-phenyl-2,3-dihydrofuran O,O′-benzylidene derivative (18)
(+)-altholactone [(+)-goniothalenol] (1) 的对映特异性全合成是一种新型四氢呋喃 5-one,对多种肿瘤细胞系具有显着的细胞毒性,已通过使用 L-阿拉伯糖作为多余的起始材料实现。关键的四氢呋喃形成是通过用硅胶处理 (2S,3R)-4,5-epoxy-5-phenyl-1,2,3-pentanetriol 1,3-benzylidene acetals 8 和 8' 的非对映异构混合物来实现的。主要环化产物 (2S,3R,4S,5S)-2-(羟甲基)-5-苯基四氢呋喃-3,4-二醇的 O,O'-亚苄基衍生物在 C-4 和 C-5 处同时进行立体化学反转(11), 到 2S,3R,4R,5R 非对映异构体 10 是通过硼氢化 (2S,3S)-3-羟基-2-(羟甲基)-5-苯基-2,3-二氢呋喃 O,O'-衍生自 11 的亚苄基衍生物 (18)。10 的 Pfitzner-Moffatt