Organocatalytic decarboxylative alkylation of <i>N</i>-hydroxy-phthalimide esters enabled by pyridine-boryl radicals
作者:Liuzhou Gao、Guoqiang Wang、Jia Cao、Dandan Yuan、Cheng Xu、Xuewen Guo、Shuhua Li
DOI:10.1039/c8cc06152a
日期:——
The decarboxylative alkylation of N-hydroxyphthalimide (NHPI) based reactive esters with olefins has been achieved via an organocatalytic strategy. Control experiments and density functional theory calculations suggest that these reactions involve a boryl-radical mediated decarboxylation pathway, which is different from the single electron transfer involved in decarboxylative alkylation reactions reported
Organocatalytic reductive coupling of aldehydes with 1,1-diarylethylenes using an <i>in situ</i> generated pyridine-boryl radical
作者:Jia Cao、Guoqiang Wang、Liuzhou Gao、Xu Cheng、Shuhua Li
DOI:10.1039/c7sc05225a
日期:——
reductive couplingreaction of aldehydes with 1,1-diarylethylenes has been established via a combination of computational and experimental studies. Density functional theory calculations and control experiments suggest that the ketyl radical from the addition of the pyridine-boryl radical to aldehydes is the key intermediate for this C–C bond formation reaction. This metal-free reductive coupling reaction
Visible-Light-Driven Reductive Carboarylation of Styrenes with CO<sub>2</sub> and Aryl Halides
作者:Hao Wang、Yuzhen Gao、Chunlin Zhou、Gang Li
DOI:10.1021/jacs.0c03144
日期:2020.5.6
The first example of visible-light-driven reductive carboarylation of styrenes with CO2 and aryl halides in a regioselective manner has been achieved. A broad range of aryl iodides and bromides were compatible with this reaction. Moreover, pyridyl halides, alkyl halides and even aryl chlorides were also viable with this method. These findings may stimulate the exploration of novel visible-light-driven
已经实现了以区域选择性方式将苯乙烯与 CO2 和芳基卤化物进行可见光驱动的还原碳芳基化的第一个例子。广泛的芳基碘化物和溴化物与该反应相容。此外,吡啶基卤化物、烷基卤化物甚至芳基氯化物也适用于该方法。这些发现可能会激发对新型可见光驱动的 Meerwein 芳基化加成反应的探索,该反应以用户友好的芳基卤作为自由基来源和 的光催化利用。
Substituent Effects on the NMR Chemical Shifts of Aromatic Side Chain Protons. I. The Effects of<i>meta</i>-Substituents
作者:Hiroaki Yamada、Yuho Tsuno、Yasuhide Yukawa
DOI:10.1246/bcsj.43.1459
日期:1970.5
The Hammett type treatment of the chemicalshift of substituted aromatic side chain protons has not always been successful. The failure might be ascribed to the neglect of magnetic longrange effects. When the corrections were made both for the ring current diminution due to the contribution of polar resonance structure of the introduced substituent and for the substituent magnetic anisotropy effect