A Facile Synthesis of Carboxamides by Dehydration Condensation Between Free Carboxylic Acids and Amines Using O,O'-Di(2-pyridyl) Thiocarbonate as a Coupling Reagent
A Convenient Method for the Preparations of Carboxamides and Peptides by Using Di(2-pyridyl) Carbonate and<b><i>O</i></b>,<b><i>O</i></b><sup>′</sup>-Di(2-pyridyl) Thiocarbonate as Dehydrating Reagents
di(2-pyridyl) carbonate (DPC) or O,O′-di(2-pyridyl) thiocarbonate (DPTC) in the presence of a catalytic amount of 4-(dimethylamino)pyridine (DMAP). The formation of 2-pyridyl esters, key intermediates of the reaction, from carboxylic acids by using DPC proceeded faster than by using DPTC; therefore, the former carbonate is more efficiently employed in the above condensation reactions.
Copper‐Catalyzed Carbonylative Hydroamidation of Styrenes to Branched Amides
作者:Yang Yuan、Fu‐Peng Wu、Claas Schünemann、Jens Holz、Paul C. J. Kamer、Xiao‐Feng Wu
DOI:10.1002/anie.202010509
日期:2020.12.7
Amides are one of the most ubiquitous functional groups in synthetic and medicinal chemistry. Novel and rapid synthesis of amides remains in high demand. In this communication, a general and efficient procedure for branch‐selective hydroamidation of vinylarenes with hydroxyamine derivatives enabled by copper catalysis has been developed for the first time. The reaction proceeds under mild conditions
Rhodium catalyzed tunable amide homologation through a hook-and-slide strategy
作者:Rui Zhang、Tingting Yu、Guangbin Dong
DOI:10.1126/science.adk1001
日期:2023.11.24
introduced alkyl chain; thus, the choice of alkylationreagent sets the homologation length. The key step involves a carbon-carbon bond activation process by a carbene-coordinated rhodium complex with assistance from a removable directing group. The approach is demonstrated for introduction of chains as long as 16 carbons and is applicable to derivatized carboxylicacids in complex bioactive molecules.
The effective use of substituted benzoic anhydrides for the synthesis of carboxamides
作者:Isamu Shiina、Yo-ichi Kawakita
DOI:10.1016/j.tet.2004.03.066
日期:2004.5
Various carboxamides are synthesized from the corresponding carboxylic acids and amines with high product-selectivities using 2-methyl-6-nitrobenzoic or 2,4,6-trichlorobenzoic anhydride in the presence of 4-(dimethylamino)pyridine. (C) 2004 Elsevier Ltd. All rights reserved.
Scope, Limitations and Mechanistic Analysis of the HyperBTM‐Catalyzed Acylative Kinetic Resolution of Tertiary Heterocyclic Alcohols**
作者:Samuel M. Smith、Mark D. Greenhalgh、Taisiia Feoktistova、Daniel M. Walden、James E. Taylor、David B. Cordes、Alexandra M. Z. Slawin、Paul Ha‐Yeon Cheong、Andrew D. Smith
DOI:10.1002/ejoc.202101111
日期:2022.1.11
isothiourea HyperBTM catalyzes the acylative kinetic resolution of a wide range of tertiary heterocyclic alcohols under mild conditions with high selectivity. The synthetic utility of the methodology has been demonstrated with the preparation of two bioactive targets. Kinetic analysis reveals a fractional reaction order with respect to the alcohol concentration.