Catalyst Controlled Divergent C4/C8 Site-Selective C–H Arylation of Isoquinolones
摘要:
The catalyst-controlled C4/C8 site-selective C-H arylation of isoquinolones using aryliodonium salts as the coupling partners was developed. The C4-selective arylation was successfully achieved via an electrophilic palladation pathway. A completely different selectivity pattern was observed using an Ir(III) catalytic system, which resulted in C-C bond formation exclusively at the C8 position. The isoquinolone scaffold can be conveniently equipped with various aryl substituents at either the C4 or C8 position.
Iridium(III)-Catalyzed Regiocontrolled Direct Amidation of Isoquinolones and Pyridones
作者:Debapratim Das、Rajarshi Samanta
DOI:10.1002/adsc.201701244
日期:2018.1.17
Iridium(III)‐catalyzed highly regiocontrolled C3/C8 amidation of isoquinolones and C6 amidation of 2‐pyridones has been successfully accomplished with various azides. The optimized method is operationally simple with a broad substrate scope. The protocol has been found to be scalable.
An efficient method for the synthesis of substituted 1(2H)-isoquinolone derivatives via nickel-catalyzed annulation of substituted 2-halobenzamides with alkynes is described. This protocol is successfully applied to the total synthesis of oxyavicine with excellent yield.
as a powerful strategy for organometallic catalysis, and yet electrocatalytic C−Hactivation is restricted to strongly N‐coordinating directing groups. The first example of electrocatalytic C−Hactivation by weak O‐coordination is presented, in which a versatileruthenium(II) carboxylate catalyst enables electrooxidative C−H/O−H functionalization for alkyne annulations in the absence of metal oxidants;
电催化已被认为是有机金属催化的有力策略,但是电催化CH活化仅限于强N配位的导向基团。给出了通过弱O配位进行电催化C-H活化的第一个例子,其中通用的羧酸钌(II)催化剂可在没有金属氧化剂的情况下实现炔烃环化的电氧化C / H / OH功能化。从而利用可持续的电力作为唯一的氧化剂。机械学的见解为简便的有机金属CH钌钌化和关键钌(0)中间体的有效电化学再氧化提供了有力的支持。
Ruthenium-Catalyzed Oxidative Annulation by Cleavage of CH/NH Bonds
作者:Lutz Ackermann、Alexander V. Lygin、Nora Hofmann
DOI:10.1002/anie.201101943
日期:2011.7.4
Bond activation in action: Unprecedented ruthenium‐catalyzed oxidative annulations of alkynes through cleavage of CH bonds set the stage for an efficient 1(2H)‐isoquinolone synthesis with ample scope (see scheme; tAm=tert‐amyl). Mechanisticstudies provided strong evidence for a rate‐limiting CH bond metalation through carboxylate assistance.
Selective annulation of benzamides with internal alkynes catalyzed by an electron-deficient rhodium catalyst
作者:Ping Zhang、Wenju Chang、Hongyun Jiao、Yanshang Kang、Wenxuan Zhao、Peipei Cui、Yong Liang、Wei-Yin Sun、Yi Lu
DOI:10.1016/j.cclet.2021.01.024
日期:2021.5
s with internalalkynes was successfully established under mild reaction conditions, with the assistance of Lewis acid silver salt. Particularly, electron-deficient benzamide substrates were smoothly transformed into the desired products in this catalytic system. The catalytic system showed a broad tolerance for different substituents on the aromatic rings or aryl, alkyl-substituted alkynes.
在路易斯酸银盐的辅助下,在温和的反应条件下成功建立了电子缺陷[Cp E RhCl 2 ] 2催化的N-五氟苯基苯甲酰胺与内部炔烃的环化反应。尤其是,在该催化体系中,缺电子的苯甲酰胺底物可以平稳地转化为所需的产物。催化体系显示出对芳环或芳基,烷基取代的炔烃上不同取代基的宽容度。