A Simple and Efficient One-pot Synthesis of 1,4-dihydropyridines Using Nano-WO<sub>3</sub>- supported Sulfonic Acid as an Heterogeneous Catalyst under Solvent-free Conditions
effective heterogeneous cat‐ alyst for the one‐pot reaction of aromatic aldehydes, β‐dicarbonyl compounds and ammonium acetate to afford 1,4‐dihydropyridine derivatives in good to excellent yields. The other main advantages of the pres‐ ent method are short reaction times, simple workup, ease in purification and environmentally benign methodology. The reaction conditions were optimized employing Response Surface
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.
Synthesis and Photochemistry of Novel 3,5-Diacetyl-1,4-dihydropyridines. II [1]
作者:Hamid R. Memarian、Mohammad Bagheri、Dietrich D�pp
DOI:10.1007/s00706-003-0139-5
日期:2004.6
In continuation of previous work some novel 3,5-diacetyl-1,4-dihydropyridine derivatives were synthesized and their photochemical behavior was studied under oxygen and argon atmosphere. Oxidation of the dihydropyridine ring and formation of pyridine derivatives was the result of the reaction. The presence of oxygen affects not only on the rate of oxidation, but also the formation of some unidentified
Cu-doped ZnO nanocrystalline powder as a catalyst for green and convenient multi-component synthesis of 1,4-dihydropyridine
作者:Heshmatollah Alinezhad、Sahar Mohseni Tavakkoli
DOI:10.1007/s11164-014-1712-8
日期:2015.9
A simple, efficient, and convenient one-step method for synthesis of Hantzsch 1,4-dihydropyridine, using Cu-doped ZnO nanocrystalline powder as a catalyst is reported. The method offers several advantages including excellent yields, green solvent, easy work-up, simplicity in operation and catalyst reusability.