Enantioselective Copper‐Catalyzed Carboetherification of Unactivated Alkenes
作者:Michael T. Bovino、Timothy W. Liwosz、Nicole E. Kendel、Yan Miller、Nina Tyminska、Eva Zurek、Sherry R. Chemler
DOI:10.1002/anie.201402462
日期:2014.6.16
Chiral saturated oxygen heterocycles are important components of bioactive compounds. Cyclization of alcohols onto pendant alkenes is a direct route to their synthesis, but few catalytic enantioselective methods enabling cyclization onto unactivated alkenes exist. Herein reported is a highly efficient copper‐catalyzed cyclization of γ‐unsaturated pentenols which terminates in CC bond formation, a
手性饱和氧杂环是生物活性化合物的重要组成部分。醇在侧链烯烃上的环化是其合成的直接途径,但很少有催化对映选择性方法能够环化到未活化的烯烃上。本文报道了一种高效的铜催化 γ-不饱和戊烯醇环化反应,其终止于形成C C 键,这是一种净烯烃碳醚化。证明了分子内和分子间 C C 键的形成,从而产生功能化的手性四氢呋喃以及稠环和桥环氧杂双环产物。过渡态计算支持顺式氧化铜立体化学测定步骤。
Diverting the 5-<i>exo</i>-Trig Oxypalladation to Formally 6-<i>endo</i>-Trig Fluorocycloetherification Product through 1,2-O/Pd(IV) Dyotropic Rearrangement
作者:Jing Gong、Qian Wang、Jieping Zhu
DOI:10.1021/jacs.3c06158
日期:2023.7.26
palladium(II)-catalyzed, Selectfluor-mediated formal 6-endo-trig fluorocycloetherification of γ-hydroxyalkenes for the synthesis of functionalized tetrahydropyrans. Mechanistically, an σ-alkyl-Pd(II) intermediate resulting from the 5-exo-trig oxypalladation process is isolated and characterized by X-ray crystallographic analysis. Its oxidation with Selectfluor to Pd(IV) triggers the chemoselective 1,2-O/Pd(IV)