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。
Nickel-catalyzed C–O/N–H, C–S/N–H, and C–CN/N–H annulation of aromatic amides with alkynes: C–O, C–S, and C–CN activation
The Ni-catalyzed reaction of ortho-phenoxy-substituted aromatic amides with alkynes in the presence of LiOtBu as a base results in C–O/N–H annulation with the formation of 1(2H)-isoquinolinones. The use of a base is essential for the reaction to proceed. The reaction proceeds, even in the absence of a ligand, and under mild reaction conditions (40 °C). An electron-donating group on the aromatic ring
在 LiO t Bu 作为碱存在下, Ni 催化的邻苯氧基取代的芳族酰胺与炔烃的反应导致 C-O/N-H 环化,形成 1( 2H )-异喹啉酮。碱的使用对于反应进行是必不可少的。即使在没有配体的情况下,在温和的反应条件(40°C)下,反应也会继续进行。芳环上的给电子基团促进反应。该反应也适用于氨基甲酸酯(C-O 键活化)、甲硫基(C-S 键活化)和氰基(C-CN 键活化)作为离去基团。
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。