作者:Benjamin J. D. Wright、John Hartung、Feng Peng、Ryan Van de Water、Haibo Liu、Quen-Hui Tan、Ting-Chao Chou、Samuel J. Danishefsky
DOI:10.1021/ja805936v
日期:2008.12.10
The "aglycone" of pluraflavin A (2) has been synthesized. The key features of this synthesis include a 1,3-dipolar cycloaddition between a nitrile oxide (cf. 14) and an olefin (22) to yield an isoxazoline followed by subsequent conversion into the gamma-pyrone of pluraflavin A. The epoxide moiety linked to the pyrone is installed prior to Diels-Alder installation of the D ring, which allows access
已合成多黄素 A (2) 的“苷元”。该合成的关键特征包括腈氧化物(参见 14)和烯烃(22)之间的 1,3-偶极环加成反应生成异恶唑啉,随后转化为多黄素 A 的 γ-吡喃酮。连接的环氧化物部分在 Diels-Alder 安装 D 环之前安装到吡喃酮,这允许在到达最终化合物的途中获得许多潜在的活性细胞毒性中间体。两种此类化合物的初步体外结果也包括在外消旋标题化合物中,显示出纳摩尔范围的细胞毒性。