作者:Kenshu Fujiwara、Yu-ichi Aki、Fuyuki Yamamoto、Mariko Kawamura、Masanori Kobayashi、Azusa Okano、Daisuke Awakura、Shunsuke Shiga、Akio Murai、Hidetoshi Kawai、Takanori Suzuki
DOI:10.1016/j.tetlet.2007.04.136
日期:2007.6
assembled from a phosphonate corresponding to the C8–C15 segment (prepared from l-malic acid in 19 steps) and an aldehyde corresponding to the C16–C20 segment (synthesized from 3-methyl-3-butenol in nine steps) by a twelve-step process including the Horner–Wadsworth–Emmons reaction, regio- and stereoselective reduction of the resulting enone, diastereoselective epoxidation, and 5-exo epoxide cleavage
在这项研究中,我们合成了腹泻性贝类毒素果胶毒素2的C8–C20和C21–C30片段。C8–C20片段由对应于C8–C15片段的膦酸酯组装而成(由l-苹果酸分19步制备) )和相当于C16–C20链段的醛(由3-甲基-3-丁烯醇分9步合成),通过12步过程进行,包括Horner-Wadsworth-Emmons反应,区域和立体选择性还原生成的烯酮,非对映选择性环氧化,以及形成C环的5- exo环氧切割。C21–C30段是从(S)-缩水甘油经13个步骤构建而成,其途径包括通过Evans方法通过5- exo环氧切割形成E环并在C27处进行立体选择性甲基化。