Synthesis of steroidal and nonsteroidal vicinal heterocyclic alcohols, N-(1-cycloalkenyl)heterocycles and their antibacterial studies
摘要:
A solvent free steroidal and nonsteroidal epoxide ring opening reaction by nitrogen containing heterocycles under microwave irradiation is described. Some of the epoxide ring opening compounds were converted to their corresponding N-(1-cycloalkenyl)heterocycles via an acid catalyzed dehydration reaction. The antimicrobial activities of the epoxide ring opening compounds and N-(1-cycloalkenyl)heterocyclic compounds were tested by agar diffusion assay. Compounds 6, 9-12, 24 and 27 showed moderate inhibition against the growth of pathogenic bacteria Escherichia coli, Pseudomonas syringae, Bacillus subtilis, Proteus vulgaris and Staphylococcus aureus. (C) 2014 Elsevier Inc. All rights reserved.
A Redox Strategy for Light-Driven, Out-of-Equilibrium Isomerizations and Application to Catalytic C–C Bond Cleavage Reactions
作者:Eisuke Ota、Huaiju Wang、Nils Lennart Frye、Robert R. Knowles
DOI:10.1021/jacs.8b12552
日期:2019.1.30
We report a general protocol for the light-driven isomerization of cyclic aliphatic alcohols to linear carbonyl compounds. These reactions proceed via proton-coupled electron-transfer activation of alcohol O-H bonds followed by subsequent C-C β-scission of the resulting alkoxy radical intermediates. In many cases, these redox-neutral isomerizations proceed in opposition to a significant energetic gradient
我们报告了光驱动的环状脂肪醇异构化为线性羰基化合物的通用协议。这些反应通过醇 OH 键的质子耦合电子转移活化进行,随后生成的烷氧基自由基中间体的 CC β 断裂。在许多情况下,这些氧化还原中性异构化与显着的能量梯度相反,产生的产品热力学稳定性低于起始材料。提出了一种机制来合理化这种不平衡行为,该机制可以作为设计由激发态氧化还原事件驱动的其他逆热力学转换的模型。
Y(NO3)3·6H2O catalyzed regioselective ring opening of epoxides with aliphatic, aromatic, and heteroaromatic amines
作者:Mayur J. Bhanushali、Nitin S. Nandurkar、Malhari D. Bhor、Bhalchandra M. Bhanage
DOI:10.1016/j.tetlet.2008.03.152
日期:2008.5
Yttrium nitrate hexahydrate [Y(NO3)3·6H2O] was found to be an efficient catalyst for selective ring opening of epoxides with aliphatic, aromatic, and heteroaromatic amines at room temperature under solvent-free conditions. The system tolerated a variety of hindered and functionalized epoxides/amines and afforded the desired β-amino alcohols at low catalyst concentration.
An efficient and rapid procedure for ring opening of various epoxides with aromatic, aliphatic and heterocyclicamines is developed at room temperature under solvent-free conditions in the presence of (C4H12N2)2[BiCl6]Cl·H2O (1 mol %). This catalyst can be reused several times without losing of its activity.
在(C 4 H 12 N 2)2 [BiCl 6 ] Cl·H 2 O存在下,在室温下在无溶剂的条件下,开发了一种高效快速的方法,可用于芳族,脂族和杂环胺的各种环氧化物的开环。(1摩尔%)。该催化剂可以重复使用几次而不会失去其活性。
Ytterbium Triflate Catalyzed Reactions of Epoxide with Nitrogen Heterocycles Under Solvent-Free Condition
作者:Sanzhong Luo、Baolian Zhang、Peng G. Wang、Jin-Pei Cheng
DOI:10.1081/scc-120022472
日期:2003.9.1
Abstract Ytterbium triflate was found to effectively catalyze the reaction of epoxides with nitrogen heterocycles. The reactions afforded hydroxyl alkylated products in high yields.
Cycloalkanes as ligand backbones part 5 [1] coordination chemistry of trans-2-pyrazol-1-ylcyclohexan-1-ol and derivatives: synthesis, spectroscopic features and solid state structures of first and second row transition metal complexes
作者:M. Barz、E. Herdtweck、W.R. Thiel
DOI:10.1016/s0277-5387(97)00499-3
日期:1998.1
Abstract The synthesis and spectroscopic and structure chemical properties of complexes with the ligands trans-2-pyrazol-1-ylcyclohexan-1-ol (1), cis-(1-amino)(2-pyrazol-1-yl)cyclohexane (2) and 2-pyrazol-1-ylcyclohexanonoxime (4) coordinated to a variety of first and second row transition metals are described. These new systems bear cycloalkane backbones, which give rise to rigid ligand arrangements