立体控制合成的(R,Z)-和(R,E)-14-甲基-8-十六烯在绝对和几何构型上均具有高立体化学纯度,这是通过使用S N 2型开环反应实现的。 (S)-β-甲基-β-丙内酯用于(R)-构型的构建,顺式加成二有机铜酸盐与乙炔以及δ2-乙烯基-δ-戊内酯的S N 2'型开环反应分别引入(Z)-和(E)-双键。
立体控制合成的(R,Z)-和(R,E)-14-甲基-8-十六烯在绝对和几何构型上均具有高立体化学纯度,这是通过使用S N 2型开环反应实现的。 (S)-β-甲基-β-丙内酯用于(R)-构型的构建,顺式加成二有机铜酸盐与乙炔以及δ2-乙烯基-δ-戊内酯的S N 2'型开环反应分别引入(Z)-和(E)-双键。
Ni-Catalyzed Sonogashira Coupling of Nonactivated Alkyl Halides: Orthogonal Functionalization of Alkyl Iodides, Bromides, and Chlorides
作者:Oleg Vechorkin、Delphine Barmaz、Valérie Proust、Xile Hu
DOI:10.1021/ja906040t
日期:2009.9.2
Ni-catalyzed Sonogashira coupling of nonactivated, beta-H-containing alkyl halides, including chlorides, is reported. The coupling is tolerant to a wide range of functional groups, including ether, ester, amide, nitrile, keto, heterocycle, acetal, and aryl halide, in both coupling partners. The coupling can be selective for a specific C-X bond (X = I, Br, Cl) and allows for orthogonal functionalization
The Nickel/Copper-Catalyzed Direct Alkylation of Heterocyclic CH Bonds
作者:Oleg Vechorkin、Valérie Proust、Xile Hu
DOI:10.1002/anie.200907040
日期:——
protocol for the cross‐coupling of non‐activated alkyl halides with heterocyclic CH bonds has been developed. The transformation is chemo‐ and regioselective and many functional groups on both coupling partners are tolerated. The method employs cheap nickel/copper catalysts, and expands significantly the scope of CH functionalization (see scheme).