Selective hydrolysis of peptides, promoted by palladium aqua complexes: kinetic effects of the leaving group, pH, and inhibitors
作者:Longgen Zhu、Nenad M. Kostic
DOI:10.1021/ja00064a019
日期:1993.6
selective internal cleavage of peptides and proteins by coordination complexes as artifiicial metallopeptidases. Palladium(II) aqua complexes attached to the sulfur atom of methionine in peptides promote, under relatively mild conditions, regioselective hydrolysis of the amide bond involving the carboxylic group of the methionine residue to which they are attached. This is a regular amide bond, and no
这项研究是朝着通过配位复合物作为人工金属肽酶选择性内部裂解肽和蛋白质的方法迈出的一步。在相对温和的条件下,与肽中甲硫氨酸的硫原子相连的钯 (II) 水络合物促进了酰胺键的区域选择性水解,该酰胺键涉及它们所连接的甲硫氨酸残基的羧基。这是一个规则的酰胺键,不涉及裂解的事先激活。使用肽 AcMet-Gly、AcMet-Ala、AcMet-Ser、AcMet-Val、AcMet-Leu 和 AcMet-Ala-Ser 以及含有水、羟基、乙二胺和乙二胺的钯 (II) 络合物研究水解动力学。 1,5-二硫杂环辛烷配体
Reactivity induced at 25 K by low-energy electron irradiation of condensed NH<sub>3</sub>–CH<sub>3</sub>COOD (1 : 1) mixture
Chemical reactivity is observed following electron irradiation of a binary mixture of ammonia (NH3) and acetic acid (CH3COOD) at 25 K, without any subsequent thermal activation, as evidenced by vibrational high resolution electron energy loss spectroscopy (HREELS). Analysis of the HREEL spectra and comparison with infrared and Raman data of different molecules are compatible with glycine formation in its zwitterionic form. The onset for electron induced reaction is found to be at about â¼13 eV. The mechanisms may involve NH radicals interaction with CH3COOD molecules. Then glycine formation does not imply any displacement of reactants, so that it involves only NH3 and CH3COOD neighboring molecules.
Selective synthesis of functionalized linear aliphatic primary amines <i>via</i> decarboxylative radical-polar crossover
作者:Robin Cauwenbergh、Prakash Kumar Sahoo、Rakesh Maiti、Abra Mathew、Rositha Kuniyil、Shoubhik Das
DOI:10.1039/d3gc03187j
日期:——
Although photoredox catalysis is already known for synthesizing amines, the synthesis of linear aliphatic amines is mostly limited to hydroaminomethylation (HAM) reactions and has never been applied to the synthesis of longer-chain linear aliphatic primary amines. Considering this, the synthesis of functionalized linear aliphatic primary amines is demonstrated by using the decarboxylative radical-polar