作者:Nandini Sharma、Vijay Bahadur、Upendra K. Sharma、Debasmita Saha、Zhenghua Li、Yogesh Kumar、Jona Colaers、Brajendra K Singh、Erik V. Van der Eycken
DOI:10.1002/adsc.201800458
日期:2018.8.17
A microwave‐assisted highly efficient intermolecular C−H functionalization sequence has been developed to access substituted isoquinolones using α‐amino acid esters as a directing group. This methodology enables a wide range of N‐benzoyl α‐amino ester derivatives to react via a Ru‐catalysed C−H bond activation sequence, to form isoquinolones with moderate to excellent yields. As an additional advantage
Rh-Catalyzed Oxidative Coupling between Primary and Secondary Benzamides and Alkynes: Synthesis of Polycyclic Amides
作者:Guoyong Song、Dan Chen、Cheng-Ling Pan、Robert H. Crabtree、Xingwei Li
DOI:10.1021/jo101596d
日期:2010.11.5
synthesis of isoquinolones from benzamides and alkynes via the oxidative ortho C−Hactivation of benzamides has been developed. Ag2CO3 proved to be an optimal oxidant when MeCN was used as a solvent, and [RhCp*Cl2]2 was utilized as an efficient catalyst. Both N-alkyl and N-aryl secondary benzamides can be applied as effective substrates. Furthermore, primary benzamides react with two alkyne units, leading
已开发出一种方法,可通过苯甲酰胺的氧化邻位C-H活化从苯甲酰胺和炔烃高产且轻松地合成异喹诺酮。当以MeCN为溶剂和[RhCp * Cl 2 ] 2时,Ag 2 CO 3被证明是最佳氧化剂。被用作有效的催化剂。N-烷基和N-芳基仲苯甲酰胺都可以用作有效的底物。此外,一级苯甲酰胺与两个炔烃单元反应,通过双重CH活化和氧化偶合生成三环产物。还证明了与结构相关的1-羟基异喹啉的反应性,其中可以同时生成含N和O的rhodocyclic中间体,从而导致构建不同的含O或N的杂环。
Rhodium-catalyzed Oxidative Coupling/Cyclization of Benzamides with Alkynes via C–H Bond Cleavage
Oxidative coupling of primary, secondary, and tertiary benzamides with internal alkynes proceeds efficiently under rhodium catalysis to selectively give the corresponding 1:1 and 1:2 coupling products, accompanied by C–H and/or N–H bond cleavages. Some of the products exhibit intense fluorescence in the solid state.
Pd/C-catalyzed synthesis of N -aryl and N -alkyl isoquinolones via C H/N H activation
作者:Zhen Shu、Yuntao Guo、Wei Li、Baiquan Wang
DOI:10.1016/j.cattod.2017.02.005
日期:2017.11
Pd/C-catalyzed direct synthesis of N-aryl and N-alkyl isoquinolones was developed via the annulation reactions of benzamides and alkynes in high yields (up to 99%) through the cleavage of CH/NH bonds. The reaction was ligand-free and air was used as oxidant. High regioselectivities were found when unsymmetrical alkynes or meta-benzamides were used as substrates. The heterocyclic carboxamide substrates
通过苯甲酰胺和炔烃的环化反应,通过C H / N H键的裂解,Pd / C催化直接合成N-芳基和N-烷基异喹诺酮。该反应不含配体,将空气用作氧化剂。当使用不对称炔烃或间苯甲酰胺作为底物时,具有较高的区域选择性。杂环羧酰胺底物,例如呋喃和噻吩衍生物,也以高收率提供了相应的产物。
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.