Synthesis and Chemiluminescence of 1,3-Disubstituted 4-Hydroxypyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-diones
摘要:
Reactions of 1,3-disubstituted 5-aminopyrazole-4-carboxylate derivatives (la-c) with dimethyl acetylenedicarboxylate gave the corresponding dimethyl 1,3-disubstituted 4-hydroxypyrazolo[3,4-b]pyridine-5,6-dicarboxylates (2a-c) which reacted with hydrazine hydrate to give 1,3-disubstituted 4-hydroxy-1H-pyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-diones (3a-d). These tricyclic pyridazine derivatives were alternatively synthesized from 4-hydroxypyrrolo[3,4-e] pyrazolo[3,4-b]pyridine-5,7-diones (7a-c) prepared by reactions of 5-aminopyrazoles (1e-g) with 1-methyl-3-methylthio-4-methoxycarbonylmaleimide (5) followed by Gould-Jacacobs reaction. These tricyclic pyridazine derivatives were evaluated for chemiluminescence. 4-Hydroxy-3-methylthio-1-phenyl-1H-pyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-dione (3d) showed the greatest chemiluminescence intensity in the presence of H2O2 and peroxidase in a solution of phosphate buffer at pH 10.
Synthesis and Chemiluminescence of 1,3-Disubstituted 4-Hydroxypyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-diones
摘要:
Reactions of 1,3-disubstituted 5-aminopyrazole-4-carboxylate derivatives (la-c) with dimethyl acetylenedicarboxylate gave the corresponding dimethyl 1,3-disubstituted 4-hydroxypyrazolo[3,4-b]pyridine-5,6-dicarboxylates (2a-c) which reacted with hydrazine hydrate to give 1,3-disubstituted 4-hydroxy-1H-pyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-diones (3a-d). These tricyclic pyridazine derivatives were alternatively synthesized from 4-hydroxypyrrolo[3,4-e] pyrazolo[3,4-b]pyridine-5,7-diones (7a-c) prepared by reactions of 5-aminopyrazoles (1e-g) with 1-methyl-3-methylthio-4-methoxycarbonylmaleimide (5) followed by Gould-Jacacobs reaction. These tricyclic pyridazine derivatives were evaluated for chemiluminescence. 4-Hydroxy-3-methylthio-1-phenyl-1H-pyrazolo[4',3':5,6]pyrido[2,3-d]pyridazine-5,8(6H,7H)-dione (3d) showed the greatest chemiluminescence intensity in the presence of H2O2 and peroxidase in a solution of phosphate buffer at pH 10.
the electronic and fluorescence spectra in solution as well as in solid state. The solvent effects on the absorption and emission spectra were theoretically investigated by the snapshots-averaged spectra obtained by the first principle molecular dynamics combined with polarizable continuum model (PCM). Alternatively, the solute–solvent interaction effect on the spectra was examined by fragment molecular
新合成的吡咯并[3,4 -b]喹嗪、溶液中的蓝绿至橙红色荧光染料和固态中的黄色至红色荧光染料,通过实验和计算研究了溶液中和固态中的电子和荧光光谱。通过第一原理分子动力学结合可极化连续介质模型(PCM)获得的快照平均光谱,从理论上研究了溶剂对吸收和发射光谱的影响。或者,通过片段分子轨道时间相关密度泛函理论(FMO-TDDFT)检查溶质-溶剂相互作用对光谱的影响,该理论考虑了明确的溶质-溶剂相互作用。结果表明,FMO-TDDFT 正确再现了 PCM 的定量预测局限性以及二氯甲烷和乙醇中的溶剂化显色位移。通过以下方法在激发态势面上分析了化合物的发光量子产率S 0 / S 1 -圆锥形交叉点。
Synthesis of Fluorescent Pyrrolo[3,4-b]quinolizine Derivatives and Evaluation as a Protein-Labeling Probe
New fluorescent compounds, pyrrolo[3,4-b]quinolizines, were synthesized in good yields via a one-pot method based on the condensation of functionalized maleimides (1 a c) with 2-pyridylacetonitrile (2a), and alkyl 2-pyridylacetates (2b, c). These pyrrolo[3,4-b]quinolizine derivatives emitted over a wide wavelength range in solution (Em max: 484-604 nm) and in the solid state (Em max: 534-640 nm). In addition, we evaluated the utility of these heterocycles as fluorescent labeling probes for BSA.
Synthesis of New Methine Class of Dyes Bearing Maleimide Ring System
Reaction of 1-methyl-3-methylthiomaleimides (1a-c) with N,N-dialkylanilines (2) under refluxing in acetic acid condition gave the corresponding 3-(4-diakylamino)phenyl-1-methylmaleimides (3a-g). Treatment of these 1-methyl-3-phenylmaleimides (3a, c) with Lawesson's reagent under refluxing in toluene afforded new blue dyes, 4-(4-dialkylamino)phenyl-3-cyano-1-methyl-5-oxopyrrole-2-thiones (5a, b) which are brilliant blue dyes appearing at 606 and 615 nm (log epsilon: 4.59 and 4.50) in UV spectra. Reaction of 4-methoxycarbonyl-1-methyl-3 -methylthiomaleimide (1b) with 3-dialkylaminophenol under the same reaction conditions gave cyclized products, 2H, 4H-[1]-benzopyrano[3,4-c]pyrrole-1,3,4-triones (6a-c) in good yields.
Synthesis and Chemiluminescence of 10-Hydroxy- and 10-Aminopyridazino[4,5-b]quinoline-1,4(2H,3H)-diones
Substituted anilines reacted with methyl 1-methyl-4-methyrthio-2,5-dioxo-3-pyrroline-3-carboxylate (1) in refluxing methanol to give the corresponding methyl 1-methyl-2,5-dioxo-4-phenylamino-3-pyrroline-3-carboxylates (3a-e) which were converted in good yields to 2-methylpyrrolo[3,4-b]quinoline derivatives (4a-e) by heating in diphenyl ether. Reaction of 4a-e with hydrazine hydrate gave 10-hydroxypyridazino[4,5-b]quinoline-1,4(2H,3H)-diones (5a-e) in good yields. The desired 10-aminopyridazino[4,5-b]quinoline-1,4(2H, 3H)-diones (8a-e) were obtained by the chlorination of 4a-e with phosphorus oxychloride followed by ammonolysis with 28% ammonium hydroxide in good yields. Compounds (5) and (8) were found to be efficiently chemiluminescent in a similarly to luminol in the presence of H2O2 and horseradish peroxidase in a solution of a phosphate buffer pH 8.0.