设计了一系列基于[1,2,5]恶二唑并[3,4- b ]吡嗪吸电子基团的D-π-A发色团。通过循环伏安法,紫外-可见光谱和发射光谱研究了π共轭连接基(1,4-亚苯基和2,5-亚噻吩基)和氨基给电子基团(二苯基氨基和咔唑-9-基)的影响。 。还使用电场感应二次谐波产生(EFISH)方法研究了二阶非线性光学性质。实验结果已经通过理论DFT计算得到了合理化。
A facile, metal-free, oxidative coupling of new 6-(hetero)aryl-[1,2,5]-oxadiazolo[3,4-b]pyrazines with pyrroles, indoles and carbazoles
作者:Yuriy A. Kvashnin、Nikita A. Kazin、Egor V. Verbitskiy、Tatyana S. Svalova、Alla V. Ivanova、Alisa N. Kozitsina、Pavel A. Slepukhin、Gennady L. Rusinov、Oleg N. Chupakhin、Valery N. Charushin
DOI:10.3998/ark.5550190.p009.828
日期:——
A facile, transition metal free, one-pot oxidative coupling reaction between 6-(hetero)aryl[1,2,5]oxadiazolo[3,4-b]pyrazines and pyrroles, indoles or carbazoles is reported. This atomeconomic C-H functionalization procedure requires only stoichiometric amounts of reacting heterocycles and an appropriate Lewis acid, as catalyst. The structures of representative new 5,6di(hetero)aryl-[1,2,5]oxadiazolo[3
据报道,6-(杂)芳基[1,2,5]恶二唑并[3,4-b]吡嗪与吡咯、吲哚或咔唑之间发生了一种简便、无过渡金属的一锅氧化偶联反应。这种原子经济的 CH 官能化过程只需要化学计量的反应杂环和合适的路易斯酸作为催化剂。具有代表性的新型 5,6di(hetero) 芳基-[1,2,5] 恶二唑并 [3,4-b] 吡嗪的结构通过 X 射线晶体学得到证实。还对带有咔唑单元的新化合物进行了氧化还原和光学测量。
Two-step synthesis of new fused systems based on [1,2,5]oxadiazolo[3,4-b]quinoxaline by a combination of the Scholl reaction and nucleophilic aromatic substitution of hydrogen (SNH)
作者:E. M. Krynina、Yu. A. Kvashnin、D. A. Gazizov、M. I. Kodess、M. A. Ezhikova、G. L. Rusinov、E. V. Verbitskiy、V. N. Charushin
DOI:10.1007/s11172-024-4281-z
日期:2024.6
A simple synthetic route to poorly available polycyclic systems with a [1,2,5]oxadiazolo-[3,4-b]quinoxaline backbone has been developed, which is based on the sequence of nucleophilic aromatic substitution of hydrogen and the Scholl cross-coupling. According to the data from electrochemical and photophysical measurements, the synthesized compounds can be potentially considered as the narrow-gap (from
Direct arylalkenylation of furazano[3,4-b]pyrazines via a new C–H functionalization protocol
作者:Nikita A. Kazin、Yuriy A. Kvashnin、Roman A. Irgashev、Wim Dehaen、Gennady L. Rusinov、Valery N. Charushin
DOI:10.1016/j.tetlet.2015.02.091
日期:2015.4
6-Styryl-5-(het)arylfurazano[3,4-b]pyrazines have been obtained by novel C-H functionalization, which is a particular case of the nucleophilic substitution of hydrogen (S-N(H)). The process is initiated by the Michael addition of morpholine at the C=C double bond of beta-nitrostyrenes, and the subsequent addition of the generated carbanion to C-6 of 5-(het)arylfurazano[3,4-b]pyrazines, followed by elimination of nitrous acid and morpholine. It has been shown that in this case, only beta-nitrostyrenes bearing electron-rich substituents on the aromatic ring are involved in arylalkenylation of furazano[3,4-b]pyrazines. (C) 2015 Elsevier Ltd. All rights reserved.
First synthesis of new polycyclic systems from ortho-di(heteroaryl)-substituted furazanopyrazine derivatives by the Scholl reaction
作者:Egor V. Verbitskiy、Yuriy A. Kvashnin、Margarita V. Medvedeva、Tatiana S. Svalova、Alisa N. Kozitsina、Oleg S. Eltsov、Gennady L. Rusinov、Valery N. Charushin