Synthesis of (−)-xialenon A by enantioselective α-deprotonation-rearrangement of a meso-epoxide
作者:David M Hodgson、Jean-Marie Galano、Martin Christlieb
DOI:10.1016/j.tet.2003.09.023
日期:2003.12
The first total synthesis of (−)-xialenon A was achieved via enantioselective transannular desymmetrisation of a substituted cycloctene oxide using an organolithium/(−)-α-isosparteine combination. Oxidation of the resulting bicyclo[3.3.0]octanol gave an enone which underwent stereoselective conjugate allylation; subsequent α′-hydroxylation on the more hindered face of a derived enone using hypervalent
(-)-len烯酮A的第一个全合成是通过使用有机锂/(-)-α-异天冬氨酸的组合对取代的环氧化烯进行对映选择性的环空脱对称而实现的。氧化所得的双环[3.3.0]辛醇得到烯酮,该烯酮经历了立体选择性共轭烯丙基化。随后使用高价碘化学在衍生的烯酮的更受阻表面上进行α'-羟基化反应,生成了天然产物。