Synthesis of a C1−C21 Subunit of the Protein Phosphatase Inhibitor Tautomycin: A Formal Total Synthesis
作者:James A. Marshall、Mathew M. Yanik
DOI:10.1021/jo0056951
日期:2001.2.1
The synthesis of a C1-C21 subunit of tautomycin is described. The convergent route employs enantioenriched allenylstannane and zinc reagents derived from (S)-3-butyn-2-ol methanesulfonate. These reagents react with appropriate aldehyde segments to yield syn and anti adducts with high diastereoselectivity. The derived lithioalkynes are joined stepwise to a CO equivalent, (MeONMe)2C=O, to afford an intermediate
描述了互变霉素C1-C21亚基的合成。收敛路线采用了对映体富集的烯丙基锡烷和衍生自(S)-3-butyn-2-ol甲磺酸盐的锌试剂。这些试剂与适当的醛链段反应,以高非对映选择性产生顺式和反加合物。将衍生的硫代炔烃逐步连接至CO当量(MeONMe)2 C = O,以提供中间体酮,该中间体酮在酸处理后转化为互变异构体的核心螺缩酮部分。通过将上述烯丙基锌试剂另一种添加到螺酮醛中来进行链延长,以高非对映选择性进行,以安装剩余的立体中心。所得的炔丙醇加合物通过炔烃的分子内氢化硅烷化和衍生的五元硅氧烷的Tamoo氧化而转化为甲基酮。该酮被证明与张伯林在先前的互变异构全合成中使用的中间体相同。