Total Synthesis of (−)‐Tetrodotoxin and 11‐norTTX‐6(
<i>R</i>
)‐ol
作者:Tomoaki Maehara、Keisuke Motoyama、Tatsuya Toma、Satoshi Yokoshima、Tohru Fukuyama
DOI:10.1002/anie.201611574
日期:2017.2
The enantioselective total synthesis of (−)‐tetrodotoxin [(−)‐TTX] and 4,9‐anhydrotetrodotoxin, which are selective blockers of voltage‐gated sodium channels, was accomplished from the commercially available p‐benzoquinone. This synthesis was based on efficient stereocontrol of the six contiguous stereogenic centers on the core cyclohexane ring through Ogasawara's method, [3,3]‐sigmatropic rearrangement
对映体选择性合成(-)-河豚毒素[(-)-TTX]和4,9-脱水河豚毒素,它们是电压门控钠通道的选择性阻滞剂,是通过市售的对-苯醌完成的。该合成是基于通过Ogasawara方法对核心环己烷环上六个连续的立体异构中心进行有效的立体控制,烯丙基氰酸酯的[3,3]-σ重排以及一氧化氮的分子内1,3-偶极环加成。我们的合成路线施加到河豚毒素同源的合成11-norTTX-6([R )-醇和4,9-脱水-11- norTTX-6(ř)-对通用中间体进行后期修改。最后一步的中性脱保护使得河豚毒素和11-norTTX-6(R)-ol易于纯化,而不会竞争脱水成4,9-脱水形式。