New entry to the synthesis of clerodane diterpenes. The first enantioselective syntheses of 7-oxo-kolavenic acid and methyl solidagonate
作者:Michiharu Kato、Hiroshi Kosugi、Tsuyoshi Ichiyanagi、Hisahiro Hagiwara、Ariko Kodaira、Takashi Kusakari、Takao Suzuki、Minako Ando、Jasmine Lee、Peter Drechsel、Bernhard Vogler
DOI:10.1016/s0040-4020(01)00821-3
日期:2001.9
three kinds of key intermediates, conjugate enones 9 and 10 for the syntheses of neo-trans-clerodanes and 11 for those of neo-cis-clerodanes. Starting with the compound 10, the first enantioselective syntheses of (−)-(5R,8S,9S,10R)-7-oxo-cleroda-3,13E-dien-15-oic acid (7-oxo-kolavenic acid) (1) and solidagonic acid (2) as its methyl ester (48) were achieved.
使用易于从(+)-nopinone(3)获得的(1 S,5 S)-(-)-马洛酮(8b)作为手性来源,我们建立了制备三种关键中间体的通用方法,合成新反式-环烷烷的共轭烯酮9和10,新-顺式-环丙烷烷的共轭烯酮为11。从化合物10开始,(-)-(5 R,8 S,9 S,10 R)-7-oxo-cleroda-3,13 E的第一对映选择性合成获得了作为其甲酯(48)的-dien-15-Oic酸(7-氧代-Kolavenic酸)(1)和多角体酸(2)。