PEG-N<sub>2</sub>O<sub>4</sub>System as an Efficient Reagent both for the Rapid Oxidation of Urazoles and 1,4-Dihydropyridines under Nonaqueous Conditions
作者:Mohammad Ali Zolfigol、Ezat Ghaemi、Elaheh Madrakian、Khodabakhsh Niknam
DOI:10.1002/jccs.200800106
日期:2008.6
impregnated on polyethyleneglycol to give a stable reagent. Polyethyleneglycol-N2O4 (PEG-N2O4) system was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones and also for the aromatization of 1,4-dihydropyridines into the corresponding pyridine derivatives under mild conditions at room temperature with good to excellent yields.
N<sub>2</sub>O<sub>4</sub>Chemisorbed onto<i>n</i>-Propylsilica Kryptofix 21 and Kriptofix 22 as Two New Functional Polymers for the Fast Oxidation of Urazoles and 1,4-Dihydropyridines
作者:Gholamabbas Chehardoli、Mohammad Ali Zolfigol、Ezat Ghaemi、Elaheh Madrakian、Khodabakhsh Niknam、Shadpour Mallakpour
DOI:10.1002/jhet.828
日期:2012.5
3‐Chloropropylsilica was reacted with Kriptofix21 or 22 in the presence of triethylamine to form N‐propylsilica Kryptofix21 and Kriptofix22. Then N2O4 was added to each of these polymers to chemisorb onto cavity of aza‐crown ethers. These functionalizedpolymers were applied for the fast and simple oxidation of urazoles and 1,4‐dihydropyridines, respectively.
在三乙胺存在下,使3-氯丙基二氧化硅与Kriptofix 21或22反应形成N-丙基二氧化硅Kryptofix 21和Kriptofix22。然后将N 2 O 4添加到这些聚合物中的每一种上,以化学吸附在氮杂冠醚的空腔中。这些功能化的聚合物分别用于快速,简单地氧化urazoles和1,4-dihydropyridines。
Construction of Polyheterocyclic Benzopyran Library with Diverse Core Skeletons through Diversity-Oriented Synthesis Pathway: Part II
作者:Mingyan Zhu、Byung Joon Lim、Minseob Koh、Seung Bum Park
DOI:10.1021/co2001907
日期:2012.2.13
diversity-oriented synthesis of polyheterocyclic small-molecule library with privileged benzopyran substructure. To ensure the synthetic efficiency, we utilized the solid-phaseparallel platform and the fluorous-tag-based solution-phase parallel platform to construct a 284-member polyheterocyclic library with six distinct coreskeletons with an average purity of 87% on a scale of 5–10 mg. This library was designed
Silica chloride/NaNO2 as a novel heterogeneous system for the oxidation of urazoles under mild conditions
作者:Mohammad Ali Zolfigol、Mehdi Torabi、Shadpour E Mallakpour
DOI:10.1016/s0040-4020(01)00832-8
日期:2001.9
Urazoles and bis-urazoles can be converted in excellent yields to their corresponding triazolinediones, with a combination of silica chloride (I), wet SiO2 and sodium nitrite in dichloromethane at room temperature.
Oxidation of Urazoles to Triazolinediones with Benzyltriphenylphosphonium Peroxymonosulfate under Solvent-Free Conditions
作者:Abdol Reza Hajipour、Shadpour E. Mallakpour、Hadi Adibi
DOI:10.1246/cl.2001.164
日期:2001.2
Benzyltriphenylphosphonium peroxymonosulfate (PhCH2Ph3PHSO5) in the presence of AlCl3 was used as an effective oxidizing reagent for the oxidation of urazoles to their corresponding triazolinediones in high yields under solvent-free conditions.