Synthesis of 3‐Aryl‐5‐methyl 4‐Substituted [1,2,4]Triazoles
作者:Johan Lindström、Martin H. Johansson
DOI:10.1080/00397910600638994
日期:2006.6
Abstract Treatment of N‐substituted acetamides with oxalyl chloride generates imidoyl chlorides, which react readily with aryl hydrazides. Following cyclization, triazoles can easily be obtained in moderate to good yields. 5‐Methyl triazoles can be further functionalized through α‐lithiation and subsequent reaction with an electrophile.
摘要 用草酰氯处理 N 取代的乙酰胺会生成亚氨基酰氯,它很容易与芳基酰肼反应。环化后,可以很容易地以中等至良好的收率获得三唑。5-甲基三唑可以通过α-锂化和随后与亲电子试剂的反应进一步功能化。
C2-Selective, Functional-Group-Divergent Amination of Pyrimidines by Enthalpy-Controlled Nucleophilic Functionalization
Synthesis of heteroaryl amines has been an important topic in organic chemistry because of their importance in small-molecule discovery. In particular, 2-aminopyrimidines represent a highlyprivilegedstructuralmotif that is prevalent in bioactive molecules, but a general strategy to introduce the pyrimidine C2–N bonds via direct functionalization is elusive. Here we describe a synthetic platform
Mechanistic Approach Toward the C4‐Selective Amination of Pyridines via Nucleophilic Substitution of Hydrogen
作者:Hoonchul Choi、Won Seok Ham、Pit van Bonn、Jianbo Zhang、Dongwook Kim、Sukbok Chang
DOI:10.1002/anie.202401388
日期:2024.6.10
Tailored pyridine reagents undergo nucleophilicsubstitution of hydrogen (SNH) reactions with activated pyridines to afford pyridyl pyridinium salts in C4-selectivity. These salts can be in situ converted to 4-aminopyridines by aqueous ammonia or utilized as synthetic linchpins for general pyridine C4-functionalization. The elucidation of the selectivity principles has further guided the C4-selective
定制的吡啶试剂与活化的吡啶发生氢的亲核取代 (S N H) 反应,得到具有 C4 选择性的吡啶基吡啶鎓盐。这些盐可以通过氨水原位转化为 4-氨基吡啶,或用作一般吡啶 C4 官能化的合成关键。选择性原理的阐明进一步指导了其他(二)嗪的C4选择性官能化。
Synthesis and structures of 1,2,4-triazoles derivatives
作者:Ning Wang、Jun-feng Sheng、Fei Song、Yu-zhu Tong、Zuo-xiang Wang
DOI:10.1134/s1070363215030330
日期:2015.3
A series of novel 1,2,4-triazole derivatives were synthesized, and their structures were characterized by IR, UV-Vis, FL, NMR, ESI-MS, and elemental analysis. In the meanwhile, the single crystal structures of 3,4-diethyl-5-(4-pyridyl)-1,2,4-triazole and 3,4-dimethyl-5-(o-hydroxyphenyl)-1,2,4-triazole were determined by X-ray diffraction.