Triton-X-100 catalyzed synthesis of 1,4-dihydropyridines and their aromatization to pyridines and a new one pot synthesis of pyridines using visible light in aqueous media
作者:Partha Pratim Ghosh、Prasun Mukherjee、Asish R. Das
DOI:10.1039/c3ra40706c
日期:——
temperature. A greener method to synthesize pyridine derivatives has also been developed by the oxidation of 1,4-dihydropyridine derivatives with almost 100% yields and also in a one pot synthesis, employing an aldehyde, ethyl acetoacetate and ammonium acetate in an aqueous micellar medium by irradiation with potassium persulphate in the presence of visiblelight. The one pot protocol offered excellent
Solvent-free efficient one-pot synthesis of Biginelli and Hantzsch compounds catalyzed by potassium phthalimide as a green and reusable organocatalyst
作者:Hamzeh Kiyani、Maryam Ghiasi
DOI:10.1007/s11164-014-1621-x
日期:2015.8
The usage of potassium phthalimide (PPI) for the simple and green one-step multicomponent synthesis of Hantzsch 1,4-dihydropyridines, polyhydroquinolines, 3,4-dihydropyrimidin-2(1H)-ones/thiones, and octahydroquinazolinones under solventless conditions at 120 °C is reported. The method is operationally simple, environmentally benign, and has relatively high yields. The other merits of this method include efficient, clean, green, and catalyst reusability.
Experimental and theoretical structural study of 2-pyridyl- and 4-hydroxyphenyl-1,4-dihydropyridine derivatives
作者:Héctor Novoa De Armas、Norbert Blaton、Oswald M. Peeters、Camiel De Ranter、Margarita Suárez、Emilio Rolando、Yamila Verdecia、Estael Ochoa、Nazario Martín、Margarita Quinteiro、Carlos Seoane、José L. Soto
DOI:10.1002/jhet.5570370627
日期:2000.11
symmetrical 1,4-DHP. The structures of these compounds have been thoroughly studied by X-ray crystallographic analysis and semiempirical (AMI) calculations. A good agreement is found between the theoretical and experimental results. In all cases, the most stable conformation fulfils all the requirements needed for exhibiting an antagonist calcium effect.
1,4-Dihydropyridine charge control agents for electrostatographic toners and developers
申请人:EASTMAN KODAK COMPANY
公开号:EP1109070A2
公开(公告)日:2001-06-20
A charge control agent is disclosed selected from the group consisting of 1,4-dihydropyridines having the following general structure:
where R1, R2, R3, R4, R5, X, and Z are defined in the specification. These compounds are useful in electrostatographic toners and developers.
本发明公开了一种电荷控制剂,它选自具有以下一般结构的 1,4-二氢吡啶类:
其中 R1、R2、R3、R4、R5、X 和 Z 的定义见说明书。这些化合物适用于电致发光调色剂和显影剂。
Light induced synthesis of symmetrical and unsymmetrical dihydropyridines in ethyl lactate–water under tunable conditions
作者:Partha Pratim Ghosh、Sanjay Paul、Asish R. Das
DOI:10.1016/j.tetlet.2012.10.106
日期:2013.1
A highly efficient environment-friendly one-pot green methodology has been developed for the synthesis of symmetrical and unsymmetrical 1,4-dihydropyridines and polyhydroquinolines following the multicomponent Hantzsch synthesis under visible light irradiation in ethyl-L-lactate-water solution at room temperature. The present methodology offers several advantages such as simple procedure, greener condition, excellent yields and short reaction time sans any catalyst, support or promoter. The developed protocol has been materialized with the involvement of a household compact tungsten lamp as the visible light source, and the manifested high selectivity of the reaction performed in ethyl lactate-water solvent mixture under tunable conditions. The Ca2+ channel blocker nitrendipine and nemadipine B were also successfully synthesized applying the developed methodology in high yields. (C) 2012 Elsevier Ltd. All rights reserved.