Regioselective Copper-Catalyzed Dicarbonylation of Imidazo[1,2-<i>a</i>]pyridines with N,N-Disubstituted Acetamide or Acetone: An Approach to 1,2-Diketones Using Molecular Oxygen
作者:Changcheng Wang、Sai Lei、Hua Cao、Shuxian Qiu、Jingyun Liu、Hao Deng、Caijuan Yan
DOI:10.1021/acs.joc.5b02417
日期:2015.12.18
A novel copper-catalyzed regioselective double carbonylation of imidazo[1,2-a]pyridines with N,N-disubstituted acetamide or acetone using molecular oxygen has been described. It has provided a new approach to synthesize 1,2-carbonyl imidazo[1,2-a]pyridines, which are important substrates and intermediates in preparation of fine chemicals. The product shares a skeleton similar to that of Zolpidem, one of the most prescribed drugs in the world. O-18-labeling experiments unambiguously established that the oxygen source of products originated from O-2 rather than H2O.
Catalyst-free direct cross-dehydrogenative coupling of imidazoheterocycles with glyoxal hydrates: an efficient approach to 1,2-diketones
作者:Tao Guo、Xiang-Heng Fu、Miao Zhang、Yu-Liu Li、Yong-Cheng Ma
DOI:10.1039/c9ob00095j
日期:——
An efficient and convenient catalyst-free synthesis of 1,2-diketones via cross-dehydrogenative coupling of imidazoheterocycles with glyoxal hydrates is described.