A sustainable and environmentallybenign direct amidation reaction of unactivated esters with amines has been developed in a continuous-flow system. A commercially available amorphous zirconium oxide was found to be an efficientcatalyst for this reaction. While the typical amidation of esters with amines requires a stoichiometric amount of a promoter or metal activator, the present continuous-flow
Manganese Catalyzed Direct Amidation of Esters with Amines
作者:Zhengqiang Fu、Xinghua Wang、Sheng Tao、Qingqing Bu、Donghui Wei、Ning Liu
DOI:10.1021/acs.joc.0c02478
日期:2021.2.5
metal catalyzed amidations remains a challenge. Here, a manganese(I)-catalyzed method for the direct synthesis of amides from a various number of esters and amines is reported with unprecedented substrate scope using a low catalyst loading. A wide range of aromatic, aliphatic, and heterocyclic esters, even in fattyacid esters, reacted with a diverse range of primary aryl amines, primary alkyl amines
Aminocarbonylations of alkenyl phosphates, chlorides, bromides, and triflates with Mo(CO)6 as a solid CO source
作者:Olof Lagerlund、Mette L.H. Mantel、Mats Larhed
DOI:10.1016/j.tet.2009.06.101
日期:2009.9
Palladium-catalyzedaminocarbonylations of alkenyl chlorides, bromides, and triflates were investigated using Mo(CO)6 as a solid carbonmonoxidesource. The reactions afforded moderate to good yields producing a wide variety of acrylamides after 20 min of microwave irradiation. In addition, the aminocarbonylationreaction was, for the first time, expanded to include alkenyl phosphates as starting materials
straightforward synthesis of various imides from olefins and CO for the first time. The established hydroamidocarbonylation reaction affords imides in good yields (up to 90 %) and with good regioselectivity (up to 99:1) when applying different alkenes and amides. The synthetic potential of the method is highlighted by the synthesis of Aniracetam by intramolecular hydroamidocarbonylation.
Enhancing Ligand‐Free Fe‐Catalyzed Aminocarbonylation of Alkynes by ZrF
<sub>4</sub>
作者:Zijun Huang、Yanan Dong、Yudong Li、Mohamed Makha、Yuehui Li
DOI:10.1002/cctc.201900995
日期:2019.11.7
Zirconium fluoride was utilized to promote efficiently iron‐catalyzed aminocarbonylation between alkynes and amines without the use of extra ligands. In particular, this new system is applicable to a wide range of amine and alkyne substrates affording α,β‐unsaturated amides in good to excellent yields. Preliminary mechanistic studies reveal the activation model involving interactions of ZF4 with both