Influence of
<i>N</i>
‐Substitution in 3‐Alkyl‐3‐hydroxyisoindolin‐1‐ones on the Stereoselectivity of Brønsted Acid‐Catalyzed Synthesis of 3‐Methyleneisoindolin‐1‐ones
作者:Nikola Topolovčan、Filip Duplić、Matija Gredičak
DOI:10.1002/ejoc.202100400
日期:2021.7.26
Brønsted acid-catalyzed dehydration of 3-alkyl-3-hydroxyisoindolin-1-ones is discussed. The reaction is efficiently catalyzed by methanesulfonic acid in acetonitrile and provides the corresponding 3-methyleneisoindolin-1-ones. The E/Z stereochemistry around the exocyclic double bond is in strong correlation with the size of the N-substituent. Selective formation of only one stereoisomer can be controlled
Improving the Yield of the Exhaustive Grignard Alkylation of N-Benzylphthalimide
作者:Viraj C. Jayawardena、Kathryn E. Fairfull-Smith、Steven E. Bottle
DOI:10.1071/ch12528
日期:——
The tetraalkylation of N-benzylphthalimide is the major yield limiting step in the common synthetic route to isoindoline nitroxides. The progress of this reaction was found to be limited by the formation of previously unobserved mono- and dialkyl side products that do not lead to the desired product. The yield for the tetraalkylation of N-benzylphthalimide with ethylmagnesium iodide could be increased
Photoredox-catalyzed radical–radical cross coupling of ketyl radicals with unstabilized primary alkyl radicals
作者:Shishen Feng、Hong Liu、Yan Li、Yewen Fang
DOI:10.1039/d4cc00620h
日期:2024.4.18
sterically hindered alcohols has been successfully developed via radical–radical coupling reactions enabled by mild and redox-neutral photocatalysis. With alkylsilicates as the radical precursors, a range of primaryalkylradicals bearing various functional groups could couple with a range of phthalimides and activated ketones.
2′-Alkynylnucleotides: A Sequence- and Spin Label-Flexible Strategy for EPR Spectroscopy in DNA
作者:Marius M. Haugland、Afaf H. El-Sagheer、Rachel J. Porter、Javier Peña、Tom Brown、Edward A. Anderson、Janet E. Lovett
DOI:10.1021/jacs.6b05421
日期:2016.7.27
Electron paramagnetic resonance (EPR) spectroscopy is a powerful method to elucidate molecular structure through the measurement of distances between conformationally well-defined spin labels. Here we report a sequence-flexible approach to the synthesis of double spin-labeled DNA duplexes, where 2'-alkynylnucleosides are incorporated at terminal and internal positions on complementary strands. Post-DNA
电子顺磁共振 (EPR) 光谱是一种通过测量构象明确定义的自旋标记之间的距离来阐明分子结构的强大方法。在这里,我们报告了一种序列灵活的方法来合成双自旋标记的 DNA 双链体,其中 2'-炔基核苷结合在互补链的末端和内部位置。DNA 合成后铜催化的叠氮化物-炔环加成 (CuAAC) 反应与各种自旋标记物能够使用双电子-电子共振实验来测量双链体上的多个距离,提供高水平的详细结构信息。