Transition metal-free oxidation of ynamides for synthesis of α-keto-imides
摘要:
Transition metal-free double oxidation of triple bonds in ynamides for synthesis of alpha-keto-imides is described. The successful key was combination of NIS and DMSO under atmospheric air in CPME solvent, and the reaction quickly proceeds at 0 degrees C within 1 h. Although the yields and substrate generality are moderate, yet the prototype protocol avoids the use of expensive, moisture-sensitive, toxic, and explosive additives, which make it potentially and significantly greener than current alternatives. (C) 2014 Elsevier Ltd. All rights reserved.