Room temperature clickable coupling electron deficient amines with sterically hindered carboxylic acids for the construction of amides
作者:Jing Liu、Shi-Meng Wang、Hua-Li Qin
DOI:10.1016/j.tet.2020.131724
日期:2020.12
A method for the synthesis of difficult-to-access amides was developed through the coupling of stericallyhindered carboxylic acids and electron deficient amines via SO2F2-mediated dehydration. The method feathers with broad substrate scope, mild conditions, excellent functional group compatibility and high yields.
通过空间受阻的羧酸和缺电子的胺通过SO 2 F 2介导的脱水的偶联,开发了一种难以合成的酰胺的合成方法。该方法具有广泛的底物范围,温和的条件,优异的官能团相容性和高收率。
A new radical-mediated intramolecular arene C(sp2)-H amidation of 3-phenylpropanamides or [1,1'-biphenyl]-2-carboxamides was developed to prepare a series of 3,4-dihydro-2(1H)-quinolinone and phenanthridone derivatives in moderate to excellent yields (33-94%). Spirolactams could also be obtained using this protocol.
Nickel-Catalyzed Denitrogenative<i>ortho</i>-Arylation of Benzotriazinones with Organic Boronic Acids: an Efficient Route to Losartan and Irbesartan Drug Molecules
作者:Vijaykumar H. Thorat、Nitinkumar Satyadev Upadhyay、Chien-Hong Cheng
DOI:10.1002/adsc.201800923
日期:2018.12.21
Denitrogenative ortho‐arylation, vinylation and methylation of 1,2,3‐benzotriazin‐4‐(3H)‐ones with organic boronic acids catalyzed by nickel complexes to give a wide range of o‐substituted benzamides were demonstrated. Further, the catalytic reaction is successfully applied to the synthesis of the popular hypertensive drugs losartan and irbesartan in high yields.
Electrochemical Synthesis of 5-Aryl-phenanthridin-6-one by Dehydrogenative N,C Bond Formation
作者:Anton Kehl、Valentina M. Breising、Dieter Schollmeyer、Siegfried R. Waldvogel
DOI:10.1002/chem.201804638
日期:2018.11.22
revealed a possible alternative to the catalytic approach. A constant current protocol, undivided cells, and a remarkably low supporting electrolyte concentration enable a novel access to N‐aryl‐phenanthridin‐6‐ones by anodic N,Cbondformation using directly generated amidyl radicals. Easy accessible starting materials, a broad scope of applicable functional groups, good yields, and a very simple set‐up are
Palladium Catalyzed Regioselective Synthesis of Substituted Biaryl Amides through Decarbonylative Arylation of Phthalimides
作者:Partha Kumar Samanta、Papu Biswas
DOI:10.1021/acs.joc.8b03157
日期:2019.4.5
cross-coupling of N-substituted phthalimides with arylhalide provides a single step direct access of a wide range of synthetically appealing ortho-substituted biarylamides in high yields through unique carbonyl (CO) replacement. The reaction proceeds through a ligand-freecondition and is well tolerant to the diverse functionality of both imide and halide units. The reaction negates any requirement of