Synthesis of Cyclobakuchiols A, B, and C by Using Conformation-Controlled Stereoselective Reactions
作者:Hidehisa Kawashima、Yuki Kaneko、Masahiro Sakai、Yuichi Kobayashi
DOI:10.1002/chem.201303538
日期:2014.1.3
positions, respectively. This product was converted to cyclobakuchiol A by demethylation and to cyclobakuchiol C by epoxidation of the CH2C(Me) group. For the synthesis of cyclobakuchiol B, the enantiomer of the above cyclohexanone derived from (−)‐β‐pinene was converted to the cyclohexane‐carboxylate, and the derived enolate was subjected to the reaction with CH2CHSOPh followed by sulfoxide elimination
与环己酮p MeOC 6 H ^ 4和CH 2 C(Me)中的取代基在C3和C4位,由(+)制备-接着还原β蒎烯和由正宗-Wittig反应转化为烯丙基吡啶甲酸甲酯和酯化。此吡啶甲酸甲酯与我的烯丙基取代2 CuMgBr ⋅ MgBr 2在ZnI存在2与进行γ区域选择性和立体选择性地得到环己烷环上的季碳中心与CH 2CH和Me分别位于轴向和赤道位置。该产物通过脱甲基转化为环爆酚A,并通过CH 2 = C(Me)基团的环氧化转化为环爆酚C。( - ) - β蒎烯转化成环己烷羧酸酯,和所导出的烯醇化物进行用CH下反应cyclobakuchiol B的合成中,上述的环己酮的对映异构体衍生自2 CHSOPh接着亚砜消除,得到中间用MeOC(O)和CH季碳中心2在轴向和赤道位置CH基团。将MeOC(= O)基团转变为Me基团,以完成环爆酚B的合成。