Copper-Mediated Tandem Oxidative C(sp<sup>2</sup>)–H/C(sp)–H Alkynylation and Annulation of Arenes with Terminal Alkynes
作者:Jiaxing Dong、Fei Wang、Jingsong You
DOI:10.1021/ol501023n
日期:2014.6.6
The copper-mediatedtandem oxidative C(sp2)–H/C(sp)–H cross-coupling and intramolecular annulation of arenes with terminal alkynes has been developed, which offers a highly efficient approach to the 3-methyleneisoindolin-1-one scaffold. In this oxidative coupling process, Cu(OAc)2 acts as both the promoter and the terminal oxidant. This protocol features a wide substrate scope; high functional group
Synthetically meaningful isoindolones were accessed by cupraelectro-catalyzed C-H activation with electricity as terminal oxidant. Thus, a versatile, inexpensive, and nontoxic Cu(OAc)(2) catalyst enabled broadly applicable C-H/N-H functionalizations on electron-rich and electron-deficient benzamides with distinct functional group tolerance and resource-economy. Detailed mechanistic studies provided strong support for a C-H alkynylation mechanism through fast C-H metalation, which likewise set the stage for cupraelectro-catalyzed C-H/C-C functionalizations in a decarboxylative fashion.