A convergent synthesis of the trans-fused hexahydrooxonine ring system and reproduction of conformational behavior shown by ring F of ciguatoxin
作者:Masayuki Inoue、Makoto Sasaki、Kazuo Tachibana
DOI:10.1016/s0040-4020(99)00620-1
日期:1999.9
hexahydrooxonine ring system has been developed. The present synthesis involves an intramolecular reaction of γ-alkoxyallylsilane with acetal to form an O-linked oxacycle and a SmI2-mediated intramolecular Reformatsky reaction for constructing an oxonane ring as the key steps. Thermodynamic behavior of the trans-fused hexahydrooxonine ring was clarified for the first time and the conformational alternation
已经开发出用于构造稠合六氢氧肟酸环系统的新策略。本发明涉及γ-烷氧基烯丙基硅烷与乙缩醛的分子内反应以形成O-连接的氧杂环和SmI 2介导的分子内Reformatsky反应,用于构建氧杂环丁烷环是关键步骤。如在雪茄毒素分子(环F)中所观察到的那样,首次澄清了转熔合六氢氧肟酸环的热力学行为,并且在6-9-6三环模型化合物1中复制了构象交替。