利用Cu(OAc)2- [Cp * RhCl 2 ] 2双金属催化体系,开发了一种由芳基酮O-乙酰基肟和内部炔烃合成氮杂杂环的方法。该反应在具有广泛取代基的肟的反-和顺-异构体上进行。Cu-Rh双金属系统可用于合成异喹啉以及β-咔啉,呋喃[2.3- c ]吡啶,吡咯并[2,3- c ]吡啶和噻吩并[2,3- c ]吡啶衍生物。
我们报告了一种远程官能化策略,该策略允许通过 Ni 催化的链从远处的烯烃位点步行来Z选择性合成(杂)芳族和脂肪族酮的甲硅烷基烯醇醚。位置选择性由链游走的方向性控制,并且与所得甲硅烷基烯醇醚的热力学偏好无关。我们的机理数据表明,在这些条件下形成Ni (I)二聚体,作为催化剂静止状态,并在与烷基溴反应后转化为 [Ni (II) -H] 作为活性链行走/功能化催化剂,最终生成稳定的 η 3 键合Ni (II) 烯醇作为关键的选择性控制中间体。
Selective Synthesis of <i>Z</i>-Silyl Enol Ethers via Ni-Catalyzed Remote Functionalization of Ketones
作者:Sinem Guven、Gourab Kundu、Andrea Weßels、Jas S. Ward、Kari Rissanen、Franziska Schoenebeck
DOI:10.1021/jacs.1c01797
日期:2021.6.9
the Z-selective synthesis of silyl enol ethers of (hetero)aromatic and aliphatic ketones via Ni-catalyzed chain walking from a distant olefin site. The positional selectivity is controlled by the directionality of the chain walk and is independent of thermodynamic preferences of the resulting silyl enol ether. Our mechanistic data indicate that a Ni(I) dimer is formed under these conditions, which
我们报告了一种远程官能化策略,该策略允许通过 Ni 催化的链从远处的烯烃位点步行来Z选择性合成(杂)芳族和脂肪族酮的甲硅烷基烯醇醚。位置选择性由链游走的方向性控制,并且与所得甲硅烷基烯醇醚的热力学偏好无关。我们的机理数据表明,在这些条件下形成Ni (I)二聚体,作为催化剂静止状态,并在与烷基溴反应后转化为 [Ni (II) -H] 作为活性链行走/功能化催化剂,最终生成稳定的 η 3 键合Ni (II) 烯醇作为关键的选择性控制中间体。
Synthesis of Azaheterocycles from Aryl Ketone <i>O</i>-Acetyl Oximes and Internal Alkynes by Cu–Rh Bimetallic Relay Catalysts
A synthetic method for azaheterocycles from aryl ketone O-acetyl oximes and internalalkynes has been developed by using the Cu(OAc)2–[Cp*RhCl2]2 bimetallic catalytic system. The reactions proceeded with both of anti- and syn-isomers of oximes with a wide scope of substituents. The Cu–Rh bimetallic system could be applied for the synthesis of isoquinolines as well as β-carboline, furo[2.3-c]pyridine
利用Cu(OAc)2- [Cp * RhCl 2 ] 2双金属催化体系,开发了一种由芳基酮O-乙酰基肟和内部炔烃合成氮杂杂环的方法。该反应在具有广泛取代基的肟的反-和顺-异构体上进行。Cu-Rh双金属系统可用于合成异喹啉以及β-咔啉,呋喃[2.3- c ]吡啶,吡咯并[2,3- c ]吡啶和噻吩并[2,3- c ]吡啶衍生物。