A novel and efficient I2-promoted oxidative coupling of acetophenes with amines to α-ketoamides is presented, which employs O2 as an environmentally friendly oxidant under metal-free conditions. Based on a series of control experiments and radical trapping experiments, plausible reaction mechanism was proposed and iminium ion was identified as a significant intermediate in this process. This methodology
Copper-catalyzed aerobic oxidative synthesis of α-ketoamides from methyl ketones, amines and NIS at room temperature
作者:Juan Zhang、Ying Wei、Shaoxia Lin、Fushun Liang、Pengjun Liu
DOI:10.1039/c2ob26586a
日期:——
A simple, efficient and practical copper-catalyzedaerobicoxidative synthesis of α-ketoamides from aryl methyl ketones, aliphatic amines and N-iodosuccinimide (NIS) has been developed. The one-pot reaction may proceed smoothly at room temperature in the open air. The possible mechanism for the formation of α-ketoamides was proposed. Molecular oxygen in air functions as both an oxidant and an oxygen
A novel synthesis of α-ketoamides from Cu-catalyzed aerobic oxidative C(sp3)–C(sp3) bondcleavage of hydrocinnamaldehydes has been developed. Readily available and environmentally benign oxygen is used as the oxidant. This reaction avoids the use of noble metal catalysts or specialized oxidants, and chemoselectively yields α-ketoamide. Moreover, based on various control experiments, a reasonable mechanism
The aerialoxidation of various 2,2-dibromo-1-aryl and heteroaryl ethanones to α-keto amides in the presence of air or oxygen and secondary amines are described. The reaction provides α-keto amides in moderate to good yields. The versatility of the reaction was established by synthesizing a series of α-keto amides by the reaction of dibromoethanones derived from aryl and heteroaryl ketones with cyclic
for α-ketoamides has been developed undermildconditions. The facile synthesis of α-ketoamides has been accomplished using aryl vinyl azides and secondary amines at room temperature. The inexpensive and readily available iodine and TBHP easily promoted the oxidative amidation process to afford diketoamide derivatives in high yields. This method involves the synthesis of ketoamide compounds via sequential