Melamine-(H<sub>2</sub>SO<sub>4</sub>)<sub>3</sub>/Melamine-(HNO<sub>3</sub>)<sub>3</sub> Instead of H<sub>2</sub>SO<sub>4</sub>/HNO<sub>3</sub>: Benign System for Oxidation/Nitration Reactions from <i>in situ</i> NO<sub>2</sub><sup>+</sup>
作者:Gholamabbas Chehardoli、Seyedeh Bahareh Azimi
DOI:10.1080/00304948.2019.1677994
日期:2019.11.2
as an oxidizing system for the oxidation of urazoles and alcohols and can also be used for the nitration of active aromatic rings under solvent-free conditions. Initially, oxidation of 4-phenylurazole was run with melamine-(HNO3)3 in the absence of melamine-(H2SO4)3. It was found that the reaction did not occur using a ten-fold excess of melamine-(HNO3)3 even after a long reaction time. However, after
Über die Michael-artige Addition cyclischer Hydrazide an aktivierte Vinylgruppen
作者:G. Zinner
DOI:10.1002/ardp.19662990405
日期:——
3,5‐Dioxo‐pyrazolidine und 3,5‐Dioxo‐1,2,4‐triazolidine reagieren glatt mit Methylvinylketon; ihre an beiden Hydrazin‐N‐Atomen unsubstituierten Derivate ergeben Bis‐Additionsprodukte und addieren sich cyclisch an Divinylsulfon. Aus Maleinhydrazid und Divinylsulfon wurde ein nicht‐cyclisches Mono‐Additionsprodukt erhalten.
3,5-二氧-吡唑烷和 3,5-二氧-1,2,4-三唑烷反应物甲基乙烯基酮;ihre an beiden Hydrazin-N-Atomen unsubstituierten Derivate ergeben Bis-Additionsprodukte und addieren sich cyclisch an Divinylsulfon。Aus Maleinhydrazid 和 Divinylsulfon wurde ein nicht-cyclisches Mono-Additionsprodukt erhalten。
Betulin-Derived Compounds as Inhibitors of Alphavirus Replication
shown to inhibit Sindbis virus, with IC50 values of 0.5, 1.9, and 6.1 μM, respectively. The latter three compounds also had significant synergistic effects against SFV when combined with 3′-amino-3′-deoxyadenosine. In contrast to previous work on other viruses, the antiviral activity of 13 was mapped to take place in virus replication phase. The efficacy was also shown to be independent of external
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。