使用2-酰基苯并咪唑衍生物和4-溴丁-2-烯酸酯在温和的条件下进行新型串联环化反应,合成了一系列新颖的取代的吡啶并[1,2- a ]苯并咪唑衍生物。使用IR,1 H NMR,13 C NMR和HRMS对化合物进行表征。确定2,7,8-三甲基-3-乙氧基羰基-4-苯基吡啶并[1,2- a ]苯并咪唑的晶体结构为正交晶。在二氯甲烷中测定吡啶并[1,2- a ]苯并咪唑的吸光度和荧光光谱。在250 nm处观察到强烈的吸收最大值,在460 nm处观察到发射最大值。吡啶并[1,2- a]的吸收光谱和荧光特性]苯并咪唑衍生物表明,连接在吡啶并[1,2- a ]苯并咪唑环上的苯基和甲基明显影响最大发射。
Synthesis, X-ray crystal structure and optical properties of novel 2-aryl-3-ethoxycarbonyl-4-phenylpyrido[1,2-a]benzimidazoles
作者:Xia Chen、He Yang、Yanqing Ge、Lei Feng、Jiong Jia、Jianwu Wang
DOI:10.1002/bio.1362
日期:2012.9
A series of novel 2-aryl-3-ethoxycarbonyl-4-phenylpyrido[1,2-a]benzimidazole derivatives were synthesized by the tandem reaction of 2-benzoyl benzimidazole and (Z)-ethyl 4-bromo-3-arylbut-2-enoate in the presence of potassium carbonate. The compounds were characterized using IR, 1H-NMR, 13C-NMR, HRMS and the structure of 6f was further determined by X-ray crystallography. Both absorption and fluorescence
Room Temperature Palladium-Catalyzed Decarboxylative Acyl/Aroylation using [Fe(III)(EDTA)(η<sup>2</sup>-O<sub>2</sub>)]<sup>3−</sup>as Oxidant at Biological pH
作者:Sugandha Sharma、Imran A. Khan、Anil K. Saxena
DOI:10.1002/adsc.201201085
日期:2013.3.11
The purple‐coloured iron peroxo complex [Fe(III)EDTA(η2‐O2)]3− as a novel reagent system for Pd‐catalyzed decarboxylative ortho‐acylation of acetanilides with α‐oxocarboxylic acids at roomtemperature in aqueous media has been realized. This reaction provides an effective access to ortho‐acylacetanilides under mild conditions.
TBHP-promoted direct oxidation reaction of benzylic C<sub>sp3</sub>–H bonds to ketones
作者:Jiajing Tan、Tianyu Zheng、Yuqi Yu、Kun Xu
DOI:10.1039/c7ra00352h
日期:——
A metal-free oxidation system employing tert-butylhydroperoxide (TBHP) has been developed for selective oxidation of structurally diverse benzylic sp3 C–H bonds. This low-cost methodology allows for rapid generation of synthetically and biologically valued arylketones in good to excellent yields from readily available alkylarenes and diarylmethanes.
Logic design and synthesis of quinoxalines via the integration of iodination/oxidation/cyclization sequences from ketones and 1,2-diamines
作者:Mi Lian、Qi Li、Yanping Zhu、Guodong Yin、Anxin Wu
DOI:10.1016/j.tet.2012.09.056
日期:2012.11
A novel protocol for the synthesis of quinoxalines has been developed from simple ketones and 1,2-diamines. This process underwent a logic approach to bis-substituted quinoxalines via a consecutive iodination/Kornblum oxidation/cyclization in the presence of I2/CuO/DMSO and to mono-substituted quinoxalines via an iodination/cyclization/aromatization in the presence of I2/CuO/K3PO4·3H2O.
从简单的酮和1,2-二胺开发了一种新颖的喹喔啉合成方案。此过程通过连续碘化经历了一个逻辑方式双-取代的喹喔啉/ kornblum氧化反应/环化在我的存在2 /的CuO / DMSO中,并通过以单取代的喹喔啉碘化/环化/芳构化中的我的存在2 /的CuO / K 3 PO 4 ·3H 2 O.
Metal-free aerobic oxidation of benzazole derivatives
作者:Aurélie Dos Santos、Laurent El Kaïm、Laurence Grimaud
DOI:10.1039/c3ob27404g
日期:——
2-Benzyl benzothiazoles and benzimidazoles are easily oxidized under air and basic conditions to give the corresponding ketones in good yields. The use of palladium acetate as a catalyst has little effect and even gives, in some cases, much lower yields.