The Enantiospecific, Stereospecific Total Synthesis of the Ring-A Oxygenated Sarpagine Indole Alkaloids (+)-Majvinine, (+)-10-Methoxyaffinisine, and (+)-<i>N</i><sub>a</sub>-Methylsarpagine, as Well as the Total Synthesis of the <i>Alstonia</i> Bisindole Alkaloid Macralstonidine
作者:Shuo Zhao、Xuebin Liao、Tao Wang、Judith Flippen-Anderson、James M. Cook
DOI:10.1021/jo030055u
日期:2003.8.1
(+)-majvinine (14), and (+)-10-methoxyaffinisine (49), as well as the first total synthesis of the Alstonia bisindole alkaloid macralstonidine (9), has been accomplished. This approach employed the Schollkopf chiral auxiliary for the stereospecific construction of the desired d-(+)-tryptophan unit required for the asymmetric Pictet-Spengler reaction. In addition, the strategy was doubly convergent for
环A氧化的沙鲁滨碱吲哚生物碱(+)-N(a)-甲基沙丁鱼碱(8),(+)-majvinine(14)和(+)-10-甲氧基affinisine(49)的第一个立体特异性,对映体总合成,以及Alstonia bisindole生物碱Macralstonidine的第一个全合成(9),已经完成。该方法采用了Schollkopf手性助剂,用于不对称Pictet-Spengler反应所需的所需d-(+)-色氨酸单元的立体定向结构。此外,该策略在烯醇盐介导的Pd(0)偶联过程中是双重收敛的,不对称的Pictet-Spengler反应可用于合成大分子化合物(2)和N(a)-甲基沙丁鱼碱(8),它提供了Macralstonidine(9)。