描述了在没有牺牲氧化剂的情况下由金催化的sp 3 –sp 2 C C 交叉偶联反应。该方法成功的关键是采用带有双(膦基)胺配体的双金属催化剂。提出了一个机制假设,并显示了模型金配合物中可观察到的金属转移、C Br 氧化加成和 C C 还原消除。我们预计这种方法将成为开发涉及氧化还原活性金催化剂的新型转化的平台。
作者:Jack A. Killion、William T. Darrow、Marshall R. Brennan、Clare A. Leahy、Alison R. Fout
DOI:10.1021/acs.organomet.1c00513
日期:2022.7.25
A Co(acac)3/PN precatalyst was developed and optimized for catalytic Kumada coupling of aryl Grignard reagents to sterically encumbered alkyl halides. The substrate scope demonstrates excellent yields for primary alkyl chlorides and bromides, including good performance using neopentyl chloride and neophyl chloride. Secondary alkyl halides were also successfully arylated in good yields, and the presence
A Co(acac) 3/PN 预催化剂是为芳基格氏试剂与空间位阻烷基卤化物的催化 Kumada 偶联而开发和优化的。底物范围展示了伯烷基氯和溴的出色收率,包括使用新戊基氯和新氯基的良好性能。仲卤代烷也以良好的收率成功芳基化,并且底物中 β-氢原子的存在不会抑制产物的形成。进行了分子间官能团耐受性筛选,表明酯和酰胺官能团在反应条件下具有良好的耐受性。含有酯、吡啶和腈官能团的亲电试剂均以良好的收率与 2-甲基溴化镁偶联,支持了耐受性筛选结果。
Gold-Catalyzed Allylation of Aryl Boronic Acids: Accessing Cross-Coupling Reactivity with Gold
作者:Mark D. Levin、F. Dean Toste
DOI:10.1002/anie.201402924
日期:2014.6.10
the absence of a sacrificial oxidant is described. Vital to the success of this method is the implementation of a bimetallic catalyst bearing a bis(phosphino)amine ligand. A mechanistic hypothesis is presented, and observable transmetalation, CBr oxidative addition, and CC reductive elimination in a model gold complex are shown. We expect that this method will serve as a platform for the development
描述了在没有牺牲氧化剂的情况下由金催化的sp 3 –sp 2 C C 交叉偶联反应。该方法成功的关键是采用带有双(膦基)胺配体的双金属催化剂。提出了一个机制假设,并显示了模型金配合物中可观察到的金属转移、C Br 氧化加成和 C C 还原消除。我们预计这种方法将成为开发涉及氧化还原活性金催化剂的新型转化的平台。