approach for the synthesis of polysubstituted pyridines has been achieved through copper-catalyzed oxidative sp3 C–H coupling of oxime acetates with toluene derivatives. Besides, benzylamine and p-toluenesulfonylhydrazone were also introduced to react with oxime acetates to enrich the diversity of this synthetic method. These transformations provide highly flexible and facile preparation of substituted pyridines
A novel and facile iron-catalyzed cyclization of ketoximeacetates and aldehydes for the green synthesis of substituted pyridines has been developed. In the presence of a FeCl3 catalyst, the reaction...
TMSOTf-mediated Kröhnke pyridine synthesis using HMDS as the nitrogen source under microwave irradiation
作者:Chieh-Kai Chan、Yi-Hsiu Chung、Cheng-Chung Wang
DOI:10.1039/d2ra00084a
日期:——
An efficient protocol for the preparation of pyridine skeletons has been successfully developed involving the TMSOTf/HMDS (trifluoromethanesulfonic acid/hexamethyldisilane) system for the intermolecular cyclization of chalcones under MW (microwave) irradiation conditions. This method provides a facile approach to synthesize 2,4,6-triaryl or 3-benzyl-2,4,6-triarylpyridines in good to excellent yields
A highly efficient one‐pot synthesis of polysubstituted pyridine has been achieved through copper‐catalyzed oxidative sp3 C−H coupling of acetophenones with toluene derivatives. Besides, the polysubstituted benzene was obtained through copper‐catalyzed coupling of acetophenones. Both of the reactions exhibited a good functional group tolerance to produce a 2,4,6‐triphenylpyridine or 1,3,5‐triarylbenzene
Microwave assisted one-pot pseudo four-component synthesis of 2,4,6-trisubstituted pyridines using γ-MnO2 nanoparticles
作者:Bagher Mohammadi
DOI:10.1007/s00706-016-1698-6
日期:2016.11
AbstractThis work described an efficient, one-pot pseudo four-component synthesis of 2,4,6-triarylpyridines. This reaction was performed undermicrowaveirradiation and solvent-free conditions in the presence of γ-MnO2 nanoparticles. Herein 2,4,6-triarylpyridines were synthesized via a simple reaction between benzyl alcohols, acetophenone, and ammonium acetate in the presence of γ-MnO2 nanoparticles in