(−)-Pseudodistomin E: First Asymmetric Synthesis and Absolute Configuration Assignment
作者:Stephen G. Davies、Ai M. Fletcher、Paul M. Roberts、James E. Thomson、David Zimmer
DOI:10.1021/acs.orglett.7b00434
日期:2017.4.7
(−)-Pseudodistomin E has been prepared for the first time, allowing its structure and absolute configuration to be confirmed. The established conjugate addition of lithium (S)-N-allyl-N-(α-methyl-p-methoxybenzyl)amide to methyl (E,E)-hepta-2,5-dienoate generated the C(2)-stereocenter, and iodolactonisation of a derivative generated the remaining two stereogenic centers. Ensuing iodide displacement
首次制备了(-)-假二甲毒素E,可以确认其结构和绝对构型。锂(S)-N-烯丙基-N-(α-甲基-对甲氧基苄基)酰胺与(E,E)-庚2,5-二烯酸甲酯的共轭加成生成C(2)-立体中心,衍生物的碘内酯化产生了剩下的两个立体生成中心。随后使用束缚策略实现了碘化物的置换,从而将氮原子引入C(5)。羧酸与二烷基锌试剂的脱羧偶联完成了十三碳二烯基链的构建。