1539-43-1Relevant articles and documents
Facile aromatisation of Hantzsch 1,4-dihydropyridines by autoxidation in the presence of p-toluenesulfonic acid in acetic acid
Zhang, Ding,Sha, Min
, p. 141 - 144 (2018)
A simple protocol to achieve the aromatisation of Hantzsch dihydropyridines in high yield was established using p-toluenesulfonic acid in acetic acid and yields of 90% were obtained at room temperature. With regards to the Hantzsch 1,4-dihydropyridines derived from alkyl aldehydes bearing one or more á-hydrogens, dealkylation products were obtained through a proposed autoxidation mechanism.
Iodoxybenzoic acid (IBX): An efficient and novel oxidizing agent for the aromatization of 1,4-dihydropyridines
Yadav,Reddy,Basak,Baishya,Narsaiah, A. Venkat
, p. 451 - 454 (2006)
Hantzsch 1,4-dihydropyridines undergo smooth aromatization catalyzed by iodoxybenzoic acid (IBX) to afford the corresponding pyridine derivatives in high yields. All the reactions were carried out in DMSO solvent at 80-85 °C for a period of two to four ho
Manganese triacetate mediated oxidation of Hantzsch 1,4- dihydropyridines to pyridines
Varma, Rajender S.,Kumar, Dalip
, p. 21 - 24 (1999)
A general and practical route for the high yield oxidative conversion of readily accessible 1,4-dihydropyridines to the corresponding pyridines is described using a relatively benign oxidant, manganese triacetate.
A metal-free catalytic aerobic aromatization of Hantzsch 1,4-dihydropyridines by N-hydroxyphthalimide
Han, Bing,Liu, Qiang,Liu, Zhengang,Mu, Ruizhu,Zhang, Wei,Liu, Zhong-Li,Yu, Wei
, p. 2333 - 2334 (2005)
4-Alkyl- and 4-aryl-Hantzsch 1,4-dihydropyridines were oxidized to the corresponding pyridine derivatives in excellent yields by molecular oxygen using N-hydroxyphthalimide (NHPI) as the catalyst. Georg Thieme Verlag Stuttgart.
Room temperature catalytic aromatization of Hantzsch 1,4-dihydropyridines by sodium nitrite in the presence of acidic silica gel
Hashemi, Mohammed M.,Ghafuri, Hossein,Karimi-Jaberi, Zahed
, p. 197 - 200 (2006)
Various alkyl, aryl, and heterocyclic Hantzsch 1,4-dihydropyridines were converted to the corresponding pyridines in excellent yields and short times using sodium nitrite in the presence of a catalytic amount of acidic silica gel at room temperature. Spri
Aromatization of 1,4-dihydropyridines with selenium dioxide
Cai, Xiao-Hua,Yang, Hai-Jun,Zhang, Guo-Lin
, p. 273 - 275 (2005)
1,4-Dihydropyridines were aromatized to corresponding pyridines using stoichiometric selenium dioxide at ambient temperature in a yield of 87%-98%.
Oxidative reactivity of S-nitrosoglutathione with Hantzsch 1,4-dihydropyridine.
Mao,Jin,Liu,Wu
, p. 741 - 742 (2000)
[formula: see text] S-Nitrosoglutathione oxidized 4-substituted Hantzsch 1,4-dihydropyridines in CH3CN/H2O or CH3CN/phosphate aqueous buffer solution to give aromatic products in various yields.
A convenient and efficient protocol for oxidative aromatization of Hantzsch 1,4-dihydropyridines using benzyltriphenylphosphonium peroxymonosulfate under almost neutral reaction conditions
Adibi, Hadi,Hajipour, Abdol Reza
, p. 1008 - 1012 (2007)
Oxidative aromatization of 4-alkyl or aryl and heterocyclic-substituted derivatives of Hantzsch 1,4-dihydropyridines to the corresponding pyridine derivatives has been studied using benzyltriphenylphosphonium peroxymonosulfate as an oxidant in the presenc
Catalytic oxidation of Hantzsch 1,4-dihydropyridines by RuCl3 under oxygen atmosphere
Mashraqui, Sabir H.,Karnik, Madhavi A.
, p. 4895 - 4898 (1998)
The first catalytic oxidation of Hantzsch 1,4-dihydropyridines is described using a catalytic amount (5 mol %) of RuCl3 in acetic acid under oxygen at room temperature. A tentative mechanism is proposed to account for the experimental observati
Aromatization of Hantzsch 1,4-Dihydropyridines with MagtrieveTM
Ko, Kwang-Youn,Kim, Ji-Yeon
, p. 3207 - 3208 (1999)
Hantzsch 1,4-dihydropyridines (1,4-DHPs) can be aromatized to pyridines by refluxing in chloroform with MagtrieveTM in high yields.
