An Efficient Synthesis of 2,4,6-Triarylpyridines via Solvent-Free Reaction between Acetophenoneoximes and Aldehydes
作者:Mehdi Adib、Shabnam Mahernia、Mohammad Mahdavi
DOI:10.1055/s-0033-1341109
日期:——
An efficient synthesis of 2,4,6-triarylpyridines is described. Heating a mixture of an acetophenoneoxime and an aldehyde under solvent-free conditions afforded Krohnke pyridines in excellent yields. In this method acetophenoneoximes are directly used for the preparation of Krohnke pyridines under metal-free conditions.
An efficient synthesis of 2,4,6-triarylpyridines is described which involves heating a mixture of an acetophenone oxime and an epoxy styrene under neutral, solvent-free conditions. Krohnke pyridine products are obtained in excellent yields. (C) 2014 Published by Elsevier Ltd.
Novel solid-supported dimerization–heteroannulation of chalcones: simple and efficient synthesis of 2,4,6-triaryl-3-methylarylpyridines
作者:Anil K. Verma、Summon Koul、Ajay P.S. Pannu、Tej K. Razdan
DOI:10.1016/j.tet.2007.06.049
日期:2007.9
2,4,6-Triaryl-3-methylarylpyridines were obtained, in 60-70% yield, by a novel one-pot solventless solid-supported dimerization-heteroannulation reaction of chalcones and compounds possessing terminal -CONH2 functionality, at 125-135 degrees C, using immobilized Bi(III) nitrate and Zn(II) chloride as co-catalyst. Initially, chalcones were prepared, in nearly quantitative yield, by a modified aldol condensation, in neutral aqueous medium, in the presence of p-toluenesodium sulfonate. (c) 2007 Elsevier Ltd. All rights reserved.
Kröhnke reaction in aqueous media: one-pot clean synthesis of 4′-aryl-2,2′:6′,2″-terpyridines
作者:Shujiang Tu、Runhong Jia、Bo Jiang、Junyong Zhang、Yan Zhang、Changsheng Yao、Shunjun Ji
DOI:10.1016/j.tet.2006.10.069
日期:2007.1
A clean aqueous Krohnke reaction process has been accomplished via a one-pot procedure of 2-acetylpyridine with aromatic aldehyde and ammonium acetate under microwave irradiation or conventional heating conditions. This method is convenient, economic and environmental friendly. (c) 2006 Elsevier Ltd. All rights reserved.
DINITRO MONOMER, DIAMINE MONOMER, POLYIMIDE AND MODIFIED POLYIMIDE
申请人:TAIWAN TEXTILE RESEARCH INSTITUTE
公开号:US20140179878A1
公开(公告)日:2014-06-26
A polyimide including a structure shown as Formula II is provided,
wherein X is halogen, A
1
is selected from one of Formula 1 to Formula 18, and n is from 2 to 500,