氢键辅助的亚硝基芳烃的邻位选择性C(sp 2)-H氨基化和随后的α-C(sp 3)-H脂肪族胺的官能化在无金属条件下实现。亚硝基芳烃和2-羟基-C-亚硝基化合物与N-杂环的环化分别提供了相对于广泛的生物学相关的环稠合的苯并咪唑和结构上新颖的多环咪唑的简便过量。发现在卤代亚硝基芳烃的C(sp 2)–H胺化过程中,亲核芳香族氢取代(S N ArH)比经典S N Ar反应更可取。
An Efficient and Chemoselective Method for Oximination of β-Diketones Under Mild and Heterogeneous Conditions
作者:Mohammad Zolfigol
DOI:10.3390/60800694
日期:——
A combination of oxalic acid dihydrate and sodium nitrite in the presence of wet SiO2 was used as an effective nitrosating agent for the nitrosation of β-diketones to their corresponding α-oximinoketones in moderate to excellent yields under mild and heterogenous conditions.
Copper catalyzed access to functionalized oxazoles from oximes via carbenoids
作者:Anugula Nagaraju、K. Sandeep、K.C. Kumara Swamy
DOI:10.1016/j.tetlet.2018.05.004
日期:2018.6
straightforward synthesis of diverse oxazoles from oximes possessing a vicinal carbonyl group has been achieved by treatment of the latter with terminal diazo compounds like ethyl/benzyl diazoacetate and diazoacetophenone (which act as carbenoids) in one pot. At least two reducible functional groups (two ester groups or cyano + ester) are simultaneously introduced in one step. This reaction involves expulsion
Synthesis and study of prototropic tautomerism of 2-(2-hydroxyphenyl)-1-hydroxyimidazoles
作者:Polina A. Nikitina、Aleksandr S. Peregudov、Tatiana Yu. Koldaeva、Ludmila G. Kuz'mina、Evgeniy I. Adiulin、Iosif I. Tkach、Valery P. Perevalov
DOI:10.1016/j.tet.2015.06.032
日期:2015.8
Novel 2-(2-hydroxyphenyl) substituted imidazoles have been synthesized. A prototropictautomerism of the 1-hydroxyimidazole derivatives has been studied. X-ray diffraction analysis and IR-spectroscopy have revealed that in the solid state the title compounds exist as the N-hydroxy tautomers. The 1H and 13C NMR spectra of the new imidazole derivatives are discussed. It has been shown that in chloroform
已经合成了新型的2-(2-羟苯基)取代的咪唑。已经研究了1-羟基咪唑衍生物的质子互变异构。X射线衍射分析和IR光谱表明,在固态下,标题化合物以N-羟基互变异构体的形式存在。讨论了新咪唑衍生物的1 H和13 C NMR光谱。已经表明,在氯仿溶液中,以N-羟基互变异构形式存在5-羰基取代的2-(2-羟基苯基)-1-羟基咪唑。向DMSO的过渡导致正在研究中的N-氧化物互变异构体1-羟基咪唑的存在。
Uncommon condensations of 1,2,3-triketone 2-oximes with o-phenylenediamine
作者:Lev Yu. Ukhin、Lyudmila G. Kuz’mina、Danil V. Alexeenko、Lyudmila V. Belousova、Anatolii S. Morkovnik、Gennadii S. Borodkin、Tatyana N. Gribanova
DOI:10.1016/j.mencom.2019.01.038
日期:2019.1
A condensation of 2-hydroxyimino-5,5-dimethylcyclohexane-1,3-dione, ninhydrin oxime and 3-hydroxyiminopentane-2,4-dione with o-phenylenediamine in the presence of CF3COOH provided 6,6-dimethyl-6,7-dihydroquinoxalino-[2,3-a]phenazine, benzimidazo[2′,1′:1,2]isoquino[3,4-b]quinoxaline, and 2-acetyl-3-methylquinoxaline oxime, respectively. An ability to form stacking dimers was found for the second product
Synthesis and antiviral activity of 1-hydroxy-2-(2-hydroxyphenyl)imidazoles against vaccinia virus
作者:P. A. Nikitina、N. I. Bormotov、L. N. Shishkina、A. Ya. Tikhonov、V. P. Perevalov
DOI:10.1007/s11172-019-2467-6
日期:2019.3
Abstract2-(2-Hydroxyplienyl)imidazole derivatives were synthesized and tested for antiviral activityagainstvacciniavirus in Vero cell culture. 1-Methylimidazole 3-oxides, 1-methoxyimidazoles, and 1H-imidazoles showed no activity, whereas some 1-hydroxyimidazole derivatives hold promise, exhibiting antiviral activity and weak cytotoxicity.
摘要 合成了 2-(2-Hydroxyplienyl) 咪唑衍生物,并在 Vero 细胞培养物中测试了其对痘苗病毒的抗病毒活性。1-甲基咪唑3-氧化物、1-甲氧基咪唑和1H-咪唑没有活性,而一些1-羟基咪唑衍生物具有抗病毒活性和弱细胞毒性。