A Convenient Synthesis of (1H-Azol-1-yl)piperidines
摘要:
A convenient preparation of 3- and 4-(1H-azol-1-yl)piperidines by arylation of azoles (i.e., pyrazoles, imidazoles, and triazoles) with 3- and 4-bromopyridines and subsequent reduction of the pyridine ring was developed. The method was extended to benzo analogues of the title compounds.
Lewis Acid Activation of Pyridines for Nucleophilic Aromatic Substitution and Conjugate Addition
作者:Sarah Abou-Shehada、Matthew C. Teasdale、Steven D. Bull、Charles E. Wade、Jonathan M. J. Williams
DOI:10.1002/cssc.201403154
日期:2015.3
clean, mild and sustainable method for the functionalization of pyridines and their analogues is reported. A zinc‐based Lewis acid is used to activate pyridine and its analogues towards nucleophilic aromatic substitution, conjugate addition, and cyclization reactions by binding to the nitrogen on the pyridine ring and activating the pyridine ring core towards further functionalization.
Nanocrystallinecopperoxide was found to be an effective heterogeneous catalyst for the N-arylation of heterocycles with activatedchloro- and fluoroarenesusing potassium carbonate as base. N-Arylated products were isolated in good to excellent yields. The catalyst can be used for five cycles with almost consistent activity.
Ligand-free Cu2O-catalyzed cross coupling of nitrogen heterocycles with iodopyridines
作者:Yong-Chua Teo、Fui-Fong Yong、Shirlyn Sim
DOI:10.1016/j.tet.2013.06.095
日期:2013.9
A practical and efficient strategy has been developed for the cross coupling of nitrogen heterocycles with halopyridines using ligand-free Cu2O as catalyst and Cs2CO3 as the base. The protocol is applicable to a series of highly functionalised heterocycles, such as 7-azaindole, indazole, indole, imidazole, pyrrole and pyrazole, affording the N-heteroaryl derivatives in high yields (up to 96%).
已经开发了一种实用且有效的策略,用于使用无配体的Cu 2 O作为催化剂和Cs 2 CO 3作为碱将氮杂环与卤代吡啶交叉偶联。该方案适用于一系列高度官能化的杂环,例如7-氮杂吲哚,吲唑,吲哚,咪唑,吡咯和吡唑,可提供高收率的N-杂芳基衍生物(最高96%)。
Rhodium and Iridium Complexes with Chelating <i>C–C′</i>-Imidazolylidene–Pyridylidene Ligands: Systematic Approach to Normal, Abnormal, and Remote Coordination Modes
作者:Candela Segarra、Elena Mas-Marzá、José A. Mata、Eduardo Peris
DOI:10.1021/om3005096
日期:2012.7.23
been used as imidazolylidene–pyridylidene ligand precursors for the preparation of rhodium(III) and iridium(III) complexes. The relative configuration of the [Him-pyH](X)2 salts determines whether the coordination of the pyridylidene occurs through the normal, abnormal, or remote form. In order to obtain complexes with the imidazolylidene part of the ligand coordinated through the abnormal form, salts
N-Heterocyclic carbene copper complex catalyzed Chan-Evans-Lam reactions of arylboronic acids with azoles and amines
作者:Mia Guo、Bing Chen、Kaixian Chen、Shunan Guo、Feng-Shou Liu、Chang Xu、Hua-Gang Yao
DOI:10.1016/j.tetlet.2022.154074
日期:2022.9
An efficient protocol of Chan-Evans-Lam reactions involving arylboronic acids and azole and amine derivatives was developed based on a series of N-heterocyclic carbene copper (Cu-NHC) complexes as the precatalysts. The relationship between the catalyst structure and catalytic properties was investigated in detail. The results demonstrated that the modification of NHC backbone with acenaphthyl group