Water-Tolerant and Atom Economical Amide Bond Formation by Metal-Substituted Polyoxometalate Catalysts
作者:Francisco de Azambuja、Tatjana N. Parac-Vogt
DOI:10.1021/acscatal.9b03415
日期:2019.11.1
A simple, safe, and inexpensive amide bond formation directly from nonactivated carboxylicacids and free amines is presented in this work. Readily available Zr(IV)- and Hf(IV)-substituted polyoxometalates (POM) are shown to be catalysts for the amide bond formationreaction under mild conditions, low catalyst loading, and without the use of water scavengers, dry solvents, additives for facilitating
Immobilized Carbodiimide Assisted Flow Combinatorial Protocol to Facilitate Amide Coupling and Lactamization
作者:Christian Dankers、Joseph Tadros、David G. Harman、Janice R. Aldrich-Wright、Thanh V. Nguyen、Christopher P. Gordon
DOI:10.1021/acscombsci.0c00001
日期:2020.5.11
injecting a single solution (1:9 dimethylformamide: dichloromethane) containing a carboxylic acid and an amine or linear peptide sequence into a continuous stream of dichloromethane. The protocol remained viable in the absence of base, did not require carboxylate preactivation which, and in concert with minimal workup requirements, enabled the isolation of products in high yields. Compared to the utilization
En Route to a Heterogeneous Catalytic Direct Peptide Bond Formation by Zr-Based Metal–Organic Framework Catalysts
作者:Francisco de Azambuja、Alexandra Loosen、Dragan Conic、Maxime van den Besselaar、Jeremy N. Harvey、Tatjana N. Parac-Vogt
DOI:10.1021/acscatal.1c01782
日期:2021.7.2
assists in lowering the barrier of key proton transfers. The proposed concepts were also used to study the formation of intermolecular peptide bond formation. While intrinsic challenges associated with the catalyst structure and water removal limit a more general intermolecular reaction scope under current conditions, the results suggest that further design of Zr-MOF catalysts could render these materials