Copper-mediated oxidative C-terminal N-dealkylation of peptide-derived ligands. A possible model for enzymatic generation of desglycine peptide amides
作者:K. Veera Reddy、Shiow Jen Jin、Pramod K. Arora、David S. Sfeir、S. C. Feke Maloney、F. L. Urbach、Lawrence M. Sayre
DOI:10.1021/ja00162a038
日期:1990.3
A number of Cu(II) complexes of peptide derivatives that coordinate via N-deprotonation at the C-terminal amino acid residue have been characterized by titrimetry and the Cu(III)-Cu(II) electrochemical potentials. Reaction of these complexes with persulfate induces oxidative decarboxylation and hydrolysis of the resulting N-acylimines to carboxamide and either HCHO, CH 3 CHO, or acetone depending on
已经通过滴定法和 Cu(III)-Cu(II) 电化学电位表征了许多肽衍生物的 Cu(II) 复合物,它们通过 C 端氨基酸残基的 N-去质子化进行了配位。这些复合物与过硫酸盐的反应会诱导产生的 N-酰基亚胺氧化脱羧和水解为甲酰胺和 HCHO、CH 3 CHO 或丙酮,具体取决于 C 末端残基的身份
SQUARIC ACID-BASED POLYMERS, THEIR MANUFACTURING PROCESSES AND THEIR USES
申请人:HYDRO-QUÉBEC
公开号:US20210032403A1
公开(公告)日:2021-02-04
Squaric acid-based polymers and their use in electrode materials and/or electrolyte compositions, as well as their production processes are described herein. Also described are electrode materials, electrodes, electrolyte compositions, electrochemical cells, electrochemical accumulators, and optoelectronic devices comprising the polymers and their uses.
Ynoate-Initiated Selective C–N Esterification of Tertiary Amines under Transition-Metal and Oxidant-Free Conditions
An efficient and selective method for metal- and oxidant-free deaminated esterification of tertiary amines is presented. In this protocol, ynoates play a key role to activate the Csp3−N bond through a process of in situ generation of zwitterionic salts. The transformations show that Csp3−N bond in the zwitterionic species has a lower dissociation energy than Csp2−N bond, leading to break preferentially