Asymmetric Total Syntheses of (−)-Jorumycin, (−)-Renieramycin G, 3-<i>e</i><i>pi</i>-Jorumycin, and 3-<i>e</i><i>pi</i>-Renieramycin G
作者:Jonathan W. Lane、Yuyin Chen、Robert M. Williams
DOI:10.1021/ja0535918
日期:2005.9.1
4-dimethoxy-3-methyl-benzyl alcohol. The synthesis features a substrate-tunable stereoselective intramolecular Pictet-Spengler-type reaction for the construction of the key pentacyclic core of both targets, bearing either the natural configuration or the epimeric configuration at C-3. With access to a C-3 epi-pentacyclic framework, 3-epi-jorumycin (32) and 3-epi-renieramycin G (34) were also successfully synthesized
(-)-jorumycin (1) 和 (-)-renieramycin G (2) 的全合成分别通过 25 和 23 步完成,从 5-benzyloxy-2,4-dimethoxy-3-methyl-benzyl 醇. 该合成具有底物可调的立体选择性分子内 Pictet-Spengler 型反应,用于构建两个目标的关键五环核心,在 C-3 处具有天然构型或差向异构构型。通过使用 C-3 表五环框架,还成功合成了 3-epi-jorumycin (32) 和 3-epi-renieramycin G (34)。此外,对 3-epi-jorumycin (32) 的初步生物学评估,以及相关的合成中间体,表明这些化合物具有显着的细胞毒性。所以,