C<sub>6</sub>
-Selective Direct Arylation of 2-Phenylpyridine <i>via</i>
an Activated <i>N</i>
-methylpyridinium Salt: A Combined Experimental and Theoretical Study
incorporation studies revealed that the C−Hbond acidity is improved significantly in N‐methylpyridinium salts compared with their N‐Oxide and N‐iminopyridinium ylide counterparts, thus solving the long‐standing problem associated with previous strategies for the synthesis of diaryl pyridines. Finally, the control experiments and DFT calculations supported a Pd‐catalyzed and Cu‐mediated mechanism in
For the development of novel antitumor agents, we designed and synthesized 2,6-diaryl-substituted pyridine derivatives bearing three aryl groups, which are the bioisosteres of terpyridine, and evaluated their biological activities. Most of the 18 prepared compounds showed moderate cytotoxicity against several human cancer cell lines. From the structure-activity relationships we may conclude that the number of aryl groups employed would be critical for their biological activities. (c) 2007 Elsevier Masson SAS. All rights reserved.
Synthesis of Asymmetrical 2,6-Diarylpyridines from Linear α,β,γ,δ-Unsaturated Ketones by Addition of Ammonium Formate Followed by Annulation
作者:Yejun Gao、Rener Chen、Yongmin Ma
DOI:10.1055/s-0037-1610725
日期:2019.10
established for the synthesis of asymmetrical 2,6-diarylpyridines by cyclization of α,β,γ,δ-unsaturated ketones with ammonium formate under air atmosphere. The reaction is metal-free and operationally convenient from readily available starting materials. Thirty-three examples have been presented, most of which show good yields. A simple and efficient method has been established for the synthesis of asymmetrical