A general strategy for the convergent synthesis of fused polycyclic ethers via B-alkyl Suzuki coupling: synthesis of the ABCD ring fragment of ciguatoxins
作者:Makoto Sasaki、Makoto Ishikawa、Haruhiko Fuwa、Kazuo Tachibana
DOI:10.1016/s0040-4020(02)00045-5
日期:2002.3
rings (18 and 29c, respectively) by the B-alkyl Suzuki coupling, introduction of a double bond into the D ring followed by reductive closure of the tetrahydropyran C ring to afford the BCD ring system 51, and, finally, ring-closing metathesis reaction to construct the oxepene A ring.
已经开发了一种用于稠合多环醚的会聚偶联的新方法,该方法依赖于内酯衍生的烯醇三氟甲磺酸酯或磷酸盐的B-烷基铃木交叉偶联。该策略已成功应用于收敛性合成的瓜瓜毒素的ABCD环片段4,瓜瓜毒素是导致瓜瓜鱼中毒的致病性毒素。合成途径包括B和D环(分别为18和29c)通过B烷基Suzuki偶合的收敛结合,在D环中引入双键,然后还原性闭合四氢吡喃C环以提供BCD环系统51,最后进行闭环易位反应,以构建氧杂环丁烯A环。