CpTiCl
<sub>2</sub>
‐Catalyzed Cross‐Coupling between Internal Alkynes and Ketones: A Novel Concept in the Synthesis of Halogenated, Conjugated Dienes
作者:Esther Roldan‐Molina、Maria M. Nievas、Jorge A. R. Navarro、J. Enrique Oltra
DOI:10.1002/chem.202001023
日期:2020.7.2
A novel concept for the synthesis of halogenated, conjugated dienes is disclosed: the CpTiCl2‐catalyzed coupling of keto‐alkynes, in the presence of Me3SiBr/Et3N⋅ HBr. This reaction provided five‐, six‐, and seven‐membered carbocycles, nitrogenated heterocycles, as well as six‐membered oxygenated heterocycles leading to a brominated conjugate diene. These products showed high reactivity in the Diels–Alder
用于卤化的,共轭二烯的合成了一种新的概念是公开:所述CpTiCl 2酮-炔烃的催化的偶联,在我的存在3 SIBR / ET 3 Ñ ⋅的HBr。该反应提供了五元,六元和七元碳环,含氮杂环以及六元含氧杂环,从而生成溴化共轭二烯。这些产物在Diels-Alder,Suzuki和Sonogashira反应中显示出高反应活性,与相应的无环酮炔烃仅三步即可得到复杂的化学结构。希望这一策略将为生物活性天然产物和新材料的合成铺平道路。