Direct amide synthesis <i>via</i> Ni-mediated aminocarbonylation of arylboronic acids with CO and nitroarenes
作者:Ni Shen、Chi Wai Cheung、Jun-An Ma
DOI:10.1039/c9cc06638a
日期:——
Herein we describe an alternative and unconventional approach of an aminocarbonylation reaction to access aryl amides from readily available and low-cost arylboronic acids and nitroarenes. Nickel metal can serve as both reductant and catalyst in this direct aminocarbonylation. This protocol exhibits a good functional group compatibility and allows a variety of aryl amides to be synthesized, including
DDQ-promoted direct transformation of benzyl hydrocarbons to amides via tandem reaction of the CDC reaction and Beckmann rearrangement
作者:Jun Qiu、Ronghua Zhang
DOI:10.1039/c3ob41218k
日期:——
An atom-efficient and transition metal-free approach to amides from the corresponding benzyl hydrocarbons through C–H and C–C bond cleavage has been developed. Mechanistic studies have shown that a DDQ-promoted cross-dehydrogenative coupling (CDC) reaction with subsequent oxidation and rearrangement are involved in this transformation.
An umpolung approach to amides via hypervalentiodine-mediatedoxidative rearrangement of N–H ketimines under mild reaction conditions is described. This strategy provides target amides with excellent selectivity in good yields. In addition, preliminary mechanistic studies demonstrated that the migration preference depends on both steric and electronic effects of the migrating groups.
A microwave-assisted N-fluorobenzenesulfonimide (NFSI)/Lewis acid-catalyzed Beckmannrearrangement was developed. The remarkable promotion to the electrophilicity of NFSI by Lewis acids was illustrated utilizing a series of readily available oxime substrates. The action model between NFSI and Lewis acids was probed by control experiments and theoretical calculations.
Copper-Catalyzed Direct Nitration on Aryl C–H Bonds by Concomitant Azidation–Oxidation with TMS Azide and TBHP under Aerobic Conditions
作者:Botla Vinayak、Malapaka Chandrasekharam
DOI:10.1021/acs.orglett.7b01489
日期:2017.7.7
An unprecedented copper-catalyzed in situ azidation–oxidation for the nitration of anilides and sulfonamides has been developed by direct CAr–H functionalization. This novel and efficient nitration protocol is achieved employing TMSN3 and TBHP without the exclusion of air or moisture. The synthetic applications of the 2-nitroanilides have been explored.
通过直接的C Ar -H功能化,开发出了前所未有的铜催化原位叠氮化氧化技术,用于苯胺和磺酰胺的硝化。使用TMSN 3和TBHP可以实现这种新颖而高效的硝化方案,而不会排除空气或湿气。已经研究了2-硝基苯胺的合成应用。