Multifunctional transformation of amide C–N bond cleavage is reported. The protocol applies to benzamide, thioamide, alcohols, and mercaptan under similar reaction conditions catalyzed by NaOTs. It is noteworthy that NaOTs can not only be recycled and reused for up to three cycles without significant loss in catalytic activity, but also catalyze gram-grade reactions. This study provides a novel solution
作者:Abolghasem (Gus) Bakhoda、Quan Jiang、Yosra M. Badiei、Jeffery A. Bertke、Thomas R. Cundari、Timothy H. Warren
DOI:10.1002/anie.201810556
日期:2019.3.11
functionalizing stronger primary and secondary C−H bonds over tertiary and benzylic C−H sites. Herein, we report a Cu catalyst that exhibits a high degree of primary and secondary over tertiary C−H bond selectivity in the amidation of linear and cyclic hydrocarbons with aroyl azides ArC(O)N3. Mechanistic and DFT studies indicate that C−H amidation involves H‐atom abstraction from R‐H substrates by nitrene intermediates
ULTRAMINE: A High-Capacity Polyethylene-Imine-Based Polymer and Its Application as a Scavenger Resin
作者:Michael Roice、S�ren F. Christensen、Morten Meldal
DOI:10.1002/chem.200400314
日期:2004.9.20
polyethylene-imine resin (ULTRAMINE) is described, and itsapplication as a scavengerresin in various acylation reactions is demonstrated. The inverse suspension polymerization technique was used for the synthesis of well-defined spherical polymer beads. Polymer beads with different cross-linking densities were synthesized according to the degree of acryloylation of the polyethylene-imine polymer. The resin was
Thioether-Directed NiH-Catalyzed Remote γ-C(sp<sup>3</sup>)–H Hydroamidation of Alkenes by 1,4,2-Dioxazol-5-ones
作者:Bingnan Du、Yuxin Ouyang、Qishu Chen、Wing-Yiu Yu
DOI:10.1021/jacs.1c05834
日期:2021.9.22
amidation of unactivated alkenes. Due to the preference for five-membered nickelacycle formation, the chain-walking isomerization initiated by the NiH insertion to an alkene can be terminated at the γ-methylene site remote from the alkene moiety. By employing 2,9-dibutyl-1,10-phenanthroline (L4) as the ligand and dioxazolones as the reagent, the amidation occurs at the γ-C(sp3)–H bonds to afford the amide
Generation of Oxyphosphonium Ions by Photoredox/Cobaloxime Catalysis for Scalable Amide and Peptide Synthesis in Batch and Continuous‐Flow
作者:Junqi Su、Jia‐Nan Mo、Xiangyang Chen、Alexander Umanzor、Zheng Zhang、Kendall N. Houk、Jiannan Zhao
DOI:10.1002/anie.202112668
日期:2022.1.26
for the synthesis of amides and peptides is reported. Synergistic cooperation between a cobaloxime and a photoredox catalyst removes the elements of H2O through the use of PPh3 as a gentle organic reductant. The deoxygenative method is compatible with gram-scale peptide synthesis and applicable to peptide fragment condensation and SPPS, which may find applications in both organic synthesis and pharmaceutical
报道了一种用于合成酰胺和肽的光催化方法。钴肟和光氧化还原催化剂之间的协同作用通过使用 PPh 3作为温和的有机还原剂去除了 H 2 O 元素。脱氧方法与克级肽合成兼容,适用于肽片段缩合和SPPS,可在有机合成和药物生产中找到应用。