Stereoselective Synthesis of Both Tetrahydropyran Rings of the Antitumor Macrolide, (−)-Lasonolide A
作者:Arun K. Ghosh、Guo-Bao Ren
DOI:10.1021/jo202631e
日期:2012.3.2
Stereoselectivesyntheses of both functionalized tetrahydropyran subunits of (−)-lasonolide A are described. These tetrahydropyran rings were constructed using catalytic asymmetric hetero Diels–Alder reactions as the key steps. The C22 quaternary stereocenter present in the upper tetrahydropyran ring was constructed by a stereoselective alkylation, and the C9 hydroxy stereochemistry of the bottom tetrahydropyran
描述了 (-)-lasonolide A 的两个功能化四氢吡喃亚基的立体选择性合成。这些四氢吡喃环是使用催化不对称杂 Diels-Alder 反应作为关键步骤构建的。存在于上四氢吡喃环中的 C22 季立体中心是通过立体选择性烷基化构建的,底部四氢吡喃的 C9 羟基立体化学是通过立体选择性环氧化和区域选择性环氧化物开环反应构建的。
Enantioselective Total Synthesis of Macrolide Antitumor Agent (−)-Lasonolide A
作者:Arun K. Ghosh、Gangli Gong
DOI:10.1021/ol0701013
日期:2007.4.1
[structure: see text] An enantioselective totalsynthesis 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