Pd- and Ni-Catalyzed Cross-Coupling Reactions of Functionalized Organozinc Reagents with Unsaturated Thioethers
作者:Laurin Melzig、Albrecht Metzger、Paul Knochel
DOI:10.1002/chem.201002850
日期:2011.3.1
serve as electrophiles in this cross‐coupling reaction. Aryl‐, heteroaryl‐, benzylic, and alkylzinc halides with sensitive functionalities, such as ester, nitrile, or ketone groups react at ambient temperature with unsaturated thioethers using a Ni catalyst. The corresponding Pd‐catalyzed reactions require slightly higher temperatures. Large‐scale cross‐coupling experiments (10–20 mmol) with N‐heterocycles
在过渡金属催化剂的存在下,各种不饱和硫醚与官能化锌试剂进行了交叉偶联反应。基于Pd(OAc)2或[Ni(acac)2的三种不同的催化体系]和配体S-Phos或DPE-Phos给出了最佳结果。基于吡啶,嘧啶,吡嗪,哒嗪,三嗪,苯并噻唑,苯并恶唑,吡咯或喹唑啉环的N-杂环硫醚,以及硫代甲基乙炔,在该交叉偶联反应中用作亲电子试剂。具有敏感官能团(如酯基,腈基或酮基)的芳基,杂芳基,苄基和烷基锌卤化物在室温下使用Ni催化剂与不饱和硫醚反应。相应的Pd催化反应需要稍高的温度。还报道了具有N杂环的大规模交叉偶联实验(10–20 mmol)。