Facile One-Pot Synthesis of 1,3,5-Trisubstituted Pyrazoles from α,β-Enones
作者:Jin Yu、Ko Hoon Kim、Hye Ran Moon、Jae Nyoung Kim
DOI:10.5012/bkcs.2014.35.6.1692
日期:2014.6.20
efficient one-pot synthesis of 1,3,5-trisubstituted pyrazoles from α,β-enones and arylhydrazinehydrochlorides has been developed. The pyrazoles were formed via a tandem formation of the correspondingpyrazolines and an acid-catalyzed aerobic oxidation process.Key Words : Pyrazoles, One-pot synthesis, Aerobic oxidation, α,β-Enones Introduction1,3,5-Trisubstituted pyrazolines are important heterocycliccompounds
Electrochemically enabled oxidative aromatization of pyrazolines
作者:Silja Hofmann、Martin Linden、Julian Neuner、Felix N. Weber、Siegfried R. Waldvogel
DOI:10.1039/d3ob00671a
日期:——
Pyrazoles are a very important structural motif widely found in pharmaceuticals and agrochemicals. An electrochemically enabled approach for the sustainable synthesis of pyrazoles via oxidativearomatization of pyrazolines is presented. Inexpensive sodium chloride is employed in a dual role as a redox mediator and supporting electrolyte in a biphasic system (aqueous/organic). The method is applicable
A copper-catalyzed efficient method for the synthesis of a diverse variety of substituted N-aryl pyrazoles from readily available α,β-alkynic N-tosyl hydrazones and diaryliodonium triflates is realized. This one-pot multi-step methodology features a broad scope with good yields, scalability, and appreciable functional group tolerance. Detailed control experiments reveal that the reaction proceeds through
Oxidative aromatization of 1,4-dihydropyridines and pyrazolines using HbA–H2O2: An efficient biomimetic catalyst system providing metabolites of drug candidates
作者:Atul Kumar、Ram Awatar Maurya、Siddharth Sharma
DOI:10.1016/j.bmcl.2009.05.056
日期:2009.8
Human hemoglobin (HbA) efficiently catalyses the oxidative aromatization of 1,4-dihydropyridines (1,4-DHPs) and pyrazolines with hydrogen peroxide in phosphate buffer. The results of the study reveal that the rates of oxidative aromatization of 1,4-DHPs are substituent dependent. Thus, the present study is very useful in understanding the metabolism of 1,4-DHP drugs in liver by cytochrome P450 and designing novel drugs as well as modifying the existing drugs for better pharmacokinetic profile. (C) 2009 Elsevier Ltd. All rights reserved.
Oxidative dehydrogenation of pyrazolines with cobalt(II) and oxygen