Intramolecular annulation of aromatic rings with N-sulfonyl 1,2,3-triazoles: divergent synthesis of 3-methylene-2,3-dihydrobenzofurans and 3-methylene-2,3-dihydroindoles
作者:Xiang-Ying Tang、Yong-Sheng Zhang、Lv He、Yin Wei、Min Shi
DOI:10.1039/c4cc08343a
日期:——
The controllable synthesis of 3-methylene-2,3-dihydrobenzofurans2and 3-methylene-2,3-dihydroindoles5has been developed via cycloisomerization of N/O-tethered aryltriazoles.
A highly effective and operationally simple method for the deuteration of phenols using NaOH as a catalyst and D2O as the deuterium source is presented. A high regioselectivity for the ortho and/or para hydrogens relative to the oxygen atom was achieved, as well as a high degree of deuterium incorporation. The method also has a high functional-group tolerance, and allowed the deuteration of complex
Shifted Selectivity in Protonation Enables the Mild Deuteration of Arenes Through Catalytic Amounts of Bronsted Acids in Deuterated Methanol
作者:Oliver Fischer、Anja Hubert、Markus R. Heinrich
DOI:10.1021/acs.joc.0c01604
日期:2020.9.18
effect” of the solvent methanol, deuterations of electron-rich aromatic systems can be carried out under mild acid catalysis and thus under far milder conditions than known so far. The exceptional functional group tolerance observed under the optimized conditions, which even includes highly acid-labile groups, results from a hitherto unexploited shifted selectivity in protonation, and enabled simple
intermediacy of an Ir-boryl complex where the substrate C–Hactivation is the turnover determining step, intriguingly without any appreciable primary KIE. The method displays a broad range of substrate scope and functional group tolerance. Numerous late-stage borylation of various important molecules and drugs were achieved using this developed strategy. The borylated compounds were further converted into
一种 Ir 催化的芳烃(例如 2-苯氧基吡啶、2-苯胺基吡啶、苄胺、苄基哌嗪、苄基吗啉、苄基吡咯烷、苄基哌啶、苄基氮杂环己烷、α-氨基酸衍生物、氨基苯基乙烷衍生物和其他重要支架)的无配体邻位硼化的有效方法) 并开发了药物。正如通过使用动力学同位素研究和 DFT 计算进行的详细机理研究所揭示的那样,该反应通过一个有趣的机理途径进行。发现催化循环涉及 Ir-硼基络合物的中间体,其中底物 C-H 活化是转换决定步骤,有趣的是没有任何明显的初级 KIE。该方法显示了广泛的底物范围和官能团耐受性。使用这种开发的策略实现了各种重要分子和药物的许多后期硼化。硼化化合物进一步转化为更有价值的官能团。此外,利用单硼化化合物的 B-N 分子内相互作用的优势,开发了一种操作简单的方法,用于选择性二硼化 2-苯氧基吡啶和许多官能化芳烃。此外,还展示了从硼化产物中去除吡啶基导向基团以实现邻硼化苯酚以及用于制备 1,2-二硼化苯的
Isotopic compounds are provided that function as thyromimetics, which compounds have utility for treating diseases such as neurodegenerative disorders. Pharmaceutical compositions containing such compounds are also provided, as are methods of their use and preparation.