作者:Arun K. Ghosh、Gangli Gong
DOI:10.1021/ol0701013
日期:2007.4.1
[structure: see text] An enantioselective total synthesis of (-)-lasonolide A is described. The upper tetrahydropyran ring was constructed stereoselectively by an intramolecular 1,3-dipolar cycloaddition reaction. The bicyclic isooxazoline led to the tetrahydropyran ring as well as the quaternary stereocenter present in the molecule. The lower tetrahydropyran ring was assembled by a catalytic asymmetric
[结构:见正文]描述了对-(-)-松香内酯A的对映选择性全合成。通过分子内的1,3-偶极环加成反应立体选择性地构建上四氢吡喃环。双环异恶唑啉导致分子中存在的四氢吡喃环以及四级立体中心。通过催化不对称杂Diels-Alder反应组装低级四氢吡喃环是关键步骤。在此一步反应中,对映选择性地安装了三个立体中心。