A supramolecular ladder motif in 2-(2,2,6,6-tetramethylpiperidin-1-yloxy)propane-1,3-diol
摘要:
An O-H...O hydrogen-bonded step-ladder motif was observed in the crystal structure of the title compound, C12H25NO3. The ladder arrangement is typical of 1,2- and 1,3-diols with a synclinal orientation of the diol functionality.
A visible-light induced green and efficient method is developed for the synthesis of α-indolyl diethyl malonates. The reaction proceeds without any photocatalysts or ligands in a green solvent in a short time. Moreover, the reaction mechanism has been clearly studied by control experiments, spectrophotometric studies and density functional theory (DFT) calculations. The results showed that the photocatalyst-free
Three-Component Synthesis of Quinolines Based on Radical Cascade Visible-Light Photoredox Catalysis
作者:Jun-Ho Choi、Cheol-Min Park
DOI:10.1002/adsc.201800734
日期:2018.9.17
Synthesis of highly substituted quinolines has been developed based on three‐component radicalcascadebased on visible‐light photoredoxcatalysis. This tandem coupling reaction has been coordinated to proceed with high chemoselectivity based on the differential electronic properties of coupling partners. Subjection of electron‐rich β‐aminoacrylates with electron‐deficient halides and alkenes to the
Visible light photoredox-catalyzed alkylation/ring expansion sequences of 1-(1-arylvinyl)cyclobutanol derivatives
作者:Su Jin Kwon、Yeon Joo Kim、Dae Young Kim
DOI:10.1016/j.tetlet.2016.08.047
日期:2016.9
A visible light-mediated photocatalytic bis(alkoxycarbonyl)methylation/ringexpansion of alkenyl cyclobutanols is described. This approach provides a mild and operationally simple access to the synthesis of bis(alkoxycarbonyl)methyl-substituted cyclic ketones from the coupling reaction of 1-(1-arylvinyl)cyclobutanols with aryl bromomalonates.
Alkoxyamines by Reaction of 2,2,6,6-Tetramethylpiperidine-1-oxoammonium Tetrafluoroborate with Enolates
作者:Hans J. Schäfer、Matthias Schämann
DOI:10.1055/s-2004-829073
日期:——
Alkoxyamines are prepared from the oxoammoniumsalt of TEMPO and enolates in one step and metal free in 47-89% yield. One of these alkoxyamines (6b) was used to polymerize styrene with a polydispersity index (PDI)=1.42 (125 °C) and 1.49 (105°C).
imidazo[1,2-a]pyridines under blue-LED irradiation using the same starting material. The desired products were isolated in moderate to high yields. Based on the results of control experiments, cyclic voltammetry and spectrophotometric studies, we proposed that the studied reaction might proceed via a radical process. Imidazo[1,2-a]pyridine diethyl malonate is not only a product, but also a main intermediate
在本报告中,开发了一种简单有效的溶剂控制化学发散方法,使用相同的起始材料在蓝光 LED 照射下实现咪唑并[1,2- a ]吡啶的 C3-乙氧基羰基甲基化/羟烷基化。所需产物以中等至高产率分离。基于对照实验、循环伏安法和分光光度法研究的结果,我们提出所研究的反应可能通过自由基过程进行。咪唑并[1,2- a ]吡啶丙二酸二乙酯不仅是产品,而且是生产咪唑并[1,2-a]羟烷基化和烷氧基烷基化产品的主要中间体]吡啶。更重要的是,光催化剂对咪唑并[1,2- a ]吡啶起到氧化剂的作用,对溴丙二酸二乙酯起到还原剂的作用。