Reaction of Pyridine‐
<i>N</i>
‐Oxides with Tertiary sp
<sup>2</sup>
‐
<i>N</i>
‐Nucleophiles: An Efficient Synthesis of Precursors for
<i>N</i>
‐(Pyrid‐2‐yl)‐Substituted
<i>N</i>
‐Heterocyclic Carbenes
作者:Dmitry I. Bugaenko、Marina A. Yurovskaya、Alexander V. Karchava
DOI:10.1002/adsc.202001063
日期:2020.12.22
N‐(Pyrid‐2‐yl)‐substituted azolium and pyridinium salts, precursors for hybrid NHC‐containing ligands, were obtained with excellent regioselectivity, employing a deoxygenative CH‐functionalization of pyridine‐N‐oxides with substituted imidazoles, thiazoles, and pyridine. Unlike the traditional SNAr‐based methods, this approach provides high yields for substrates bearing substituents of different electronic
通过使用取代的咪唑,噻唑和吡啶对吡啶-N-氧化物进行脱氧CH-官能团化反应,获得了具有出色的区域选择性的N-(吡啶-2-基)-取代的azo盐和吡啶鎓盐,具有优异的区域选择性。。与传统的基于S N Ar的方法不同,此方法可为带有不同电子性质取代基的底物提供高收率。吡啶基取代的咪唑基-2-硫酮,苯并二氮杂以及2-氨基吡啶的合成也突出了如此制备的偶氮盐和吡啶鎓盐的用途。
Synthesis of novel ring-substituted histidines and histamines
作者:Rahul Jain、Louis A. Cohen、Michael M. King
DOI:10.1016/s0040-4020(97)00177-4
日期:1997.3
Synthesis of novel 2-cycloalkyl-L-histidines and 2-cycloalkylhistamines via radical alkylation with cycloalkylcarboxylic acids and silver nitrate in the presence of 10% H2SO4 by ammonium persulfate is described. The method is also extended to the synthesis of 1,2-dialkyl-L-histidines and 1,2-dialkylhistamines.
描述了在过硫酸铵存在的10%H 2 SO 4存在下,通过与环烷基羧酸和硝酸银的自由基烷基化反应来合成新型的2-环烷基-L-组氨酸和2-环烷基组胺。该方法还扩展到1,2-二烷基-L-组氨酸和1,2-二烷基组胺的合成。
Regiospecific alkylation of histidine and histamine at N-1 (τ)
作者:Rahul Jain、Louis A. Cohen
DOI:10.1016/0040-4020(96)00187-1
日期:1996.4
Series of 1-alkyl histidines and histamines have been synthesized by the alkylation of the corresponding 5,6,7,8-tetrahydro-5-oxoimidazo[1,5-c]pyrimidines with alkyl halides in aprotic solvents. The method of conversion of the intermediate quaternary salt to the amino acid or amine depends on the nature of the alkyl group.