摘要/Abstract

Elansolid A1/A2是从滑行细菌Chitinophaga sanctii中分离出来的次级代谢产物, 具有抗菌活性. 迄今为止, 该天然产物的全合成尚未被报道, 主要由于其化学结构复杂, 包含反式四氢茚烷单元、(Z)-(E)-(Z)共轭三烯及19元大环内酯结构. 在此研究中, 两种含氧官能团的底物被合成出来并考察了这两种底物在手性磷酸催化下进行分子内的仿生Diels-Alder反应(IMDA), 成功地构建了Elansolid A1/A2中的反式四氢茚烷核心骨架, 且该Diels-Alder反应的非对映选择性提高到了1.8∶1以及减少了合成步骤.
关键词: 仿生合成, Diels-Alder反应, 四氢茚烷, Elansolid
The Elansolid A1/A2 is metabolite from the gliding bacteriumChitinophaga sanctiiand shows antibiotic activity against Gram-positive bacteria. Up to now, the total synthesis of this natural product has not been reported yet due to its structure complexity, which arises from thetrans-tetrahydroindane unit and (Z)-(E)-(Z) triene motif as well as a 19-member macrolactone. In this study, two newO-functionalized substrates were synthesized to undergo the biomimetic intramolecular Diels-Alder reactions (IMDA) catalyzed by a chiral phosphoric acid to build the keytrans-tetrahydroindane core of Elansolid A1/A2 via a vinylicp-quinone methide intermediate. This result shows that an improveddr (1.8∶1) of IMDA reaction and shorter synthetic steps could be achieved.
Key words: biomimetic synthesis, Diels-Alder reaction, tetrahydroindane, elansolid


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