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。
1,4-Diazabicyclo[2.2.2]octane-Catalyzed One-Pot Synthesis of Pyrazolo[1,2-<i>a</i>][1,2,4]triazole-1,3-diones under Ultrasound Acceleration
作者:Davood Azarifar、Razieh Nejat-Yami、Mohammad Ali Zolfigol
DOI:10.1002/jhet.1706
日期:2013.11
1,4‐Diazabicyclo[2.2.2]octane has been explored as an efficient catalyst to effect the three‐component condensation reactions between malononitrile, 4‐arylurazoles, and aromatic aldehydes in ethanol underultrasound irradiation conditions. The reactions proceeded very rapidly under mild conditions to furnish the corresponding pyrazolo[1,2‐a][1,2,4]triazole‐1,3‐dione derivatives in excellent yields
1,4-二氮杂双环[2.2.2]辛烷已被研究为在超声辐射条件下在乙醇中实现丙二腈,4-芳基脲和芳香醛之间三组分缩合反应的有效催化剂。反应在温和的条件下进行非常迅速,以优异的产率得到了相应的吡唑并[1,2- a ] [1,2,4]三唑-1,3-二酮衍生物。
Catalytic and Efficient Oxidation of Urazole Derivatives to Their Corresponding Triazolinediones Using Ammonium Nitrate and Metal Hydrogen Sulfate as Catalyst
Catalyticoxidation of a variety of urazoles to the triazolinediones via combination of NH4NO3 in the presence of a catalytic amount of aluminium hydrogensulfate has been developed at room temperature in dichloromethane.
已经在室温下在二氯甲烷中开发了在催化量的硫酸氢铝存在下,通过NH 4 NO 3的组合,将多种脲唑催化氧化为三唑啉二酮的方法。
EFFICIENT SYNTHESIS OF NOVEL 4-SUBSTITUTED URAZOLES
The efficient synthesis of several new and novel 4-substituted triazolidindiones (urazoles) starting from isocyanates, amines, anilines and carboxylic acids is reported.