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。
Rhodium-Catalyzed Oxidative Cycloaddition of Benzamides and Alkynes via C−H/N−H Activation
作者:Todd K. Hyster、Tomislav Rovis
DOI:10.1021/ja103776u
日期:2010.8.4
The oxidative cycloaddition of benzamides and alkynes has been developed. The reaction utilizes Rh(III) catalysts in the presence of Cu(II) oxidants, and is proposed to proceed by N-H metalation of the amide followed by ortho C-H activation. The resultant rhodacycle undergoes alkyne insertion to form isoquinolones in good yield. The reaction is tolerant of extensive substitution on the amide, alkyne, and arene, including halides, silyl ethers, and unprotected aldehydes as substituents. Unsymmetrical alkynes proceed with excellent regioselectivity, and heteroaryl carboxamides are tolerated leading to intriguing scaffolds for medicinal chemistry. A series of competition experiments shed further light on the mechanism of the transformation and reasons for selectivity.