Relatively less expensive Pd-catalysed oxidative coupling reactions for the preparation of N-alkyl and N-arylsubstituted isoquinolones and their derivatives have been developed. A broad reaction scope has been demonstrated. In addition, studies of the reaction additives and mechanistic insights, as well as KIE studies for a better understanding of the reaction pathway, have been discussed.
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。