Total synthesis of eudesmane terpenes: cyclase phase
作者:Ke Chen、Yoshihiro Ishihara、María Morón Galán、Phil S. Baran
DOI:10.1016/j.tet.2010.02.088
日期:2010.6
of the lowest oxidized members of the eudesmane family of natural products, is presented. The final synthetic sequence illustrates a nine-step, gram-scale, enantioselective route to this bicyclic terpene with excellent stereocontrol and in 21% overall yield.
What a relief! In 1955, strainrelease was put forward as a reactivity factor to explain the differing reactivity of axial and equitorial alcohols during oxidation. The same rationale may account for the differing rates of activation between axial and equitorial CH bonds in CHactivation processes (see scheme).
终于解脱了!1955 年,提出应变释放作为反应性因素来解释轴向和等向醇在氧化过程中的不同反应性。相同的基本原理可以解释在 C H 激活过程中轴向和赤道 C H 键之间不同的激活率(参见方案)。