Ruthenium-Catalyzed Carbon−Carbon Bond Formation via the Cleavage of an Unreactive Aryl Carbon−Nitrogen Bond in Aniline Derivatives with Organoboronates
作者:Satoshi Ueno、Naoto Chatani、Fumitoshi Kakiuchi
DOI:10.1021/ja0713431
日期:2007.5.1
refluxing toluene gave the corresponding phenylation product in 83% yield via aryl carbon−nitrogen bondcleavage. This reaction involves two notable features: (1) the coupling proceeds via the oxidative addition of an aryl carbon−nitrogen bond in anilines to the ruthenium complex, and (2) C−C bondformation takes place via transmetalation between the Ru−NR2 species and organoboronates.
One-Pot Procedure for the Synthesis of 1,5-Benzodiazepines from<i>N</i>-Allyl-2-bromoanilines
作者:Marco Weers、Lars H. Lühning、Vanessa Lührs、Christian Brahms、Sven Doye
DOI:10.1002/chem.201604561
日期:2017.1.26
to pharmacologically relevant 1,5‐benzodiazepines. The process takes advantage of the excellent regioselectivity of the initial hydroaminoalkylation performed in the presence of a titanium mono(formamidinate) catalyst and the fact that the exclusively formed branched hydroaminoalkylation products can only undergo palladium‐catalyzed cyclization to 1,5‐benzodiazepines.
The transition-metal-catalyzed cyclopropanation of alkenes by the decomposition of diazo compounds is a powerful and straightforward strategy to produce cyclopropanes, but is tempered by the potentially explosive nature of diazo substrates. Herein we report the Mo-catalyzed regiospecific deoxygenative cyclopropanation of readily available and bench-stable 1,2-dicarbonyl compounds, in which one of the
通过重氮化合物的分解,过渡金属催化的烯烃环丙烷化是一种强大而直接的生产环丙烷的策略,但受到重氮底物潜在爆炸性的影响。在此,我们报告了 Mo 催化的易得且实验室稳定的 1,2-二羰基化合物的区域特异性脱氧环丙烷化,其中两个羰基之一在脱氧时充当卡宾等价物,并参与随后的环丙烷化过程。使用市售的 Mo 催化剂提供了一系列有价值的环丙烷,具有独特的区域选择性,产率高达 90%。该方法的合成效用通过克级合成、后期功能化和简单单羰基化合物的环丙烷化得到进一步证明。
Radical reactions initiated by the photochemical cleavage of carbon–indium bonds of organoindium compounds
Intra- and intermolecular reactions of carbon-centered radicals generated by photolysis of organoindium compounds were examined. The photolysis of vinylindium compounds and indium acetylides provided vinyl and alkynyl radicals, respectively, which were trapped with ethyl iodoacetate giving the corresponding beta,gamma-unsaturated esters. Allylic indium compounds, prepared from 8-bromo- or 8-iodooct-1,6-dienes and powdered indium metal, underwent an intramolecular radical cyclization to afford the 5-exo-trig product. (c) 2008 Elsevier Ltd. All rights reserved.