Stereoselective Synthesis of Isoxazolidines via Copper-Catalyzed Alkene Diamination
作者:Zainab M. Khoder、Christina E. Wong、Sherry R. Chemler
DOI:10.1021/acscatal.7b01362
日期:2017.7.7
A convenient copper-catalyzed intramolecular/intermolecular alkene diamination reaction to synthesize 3-aminomethyl-functionalized isoxazolidines under mild reaction conditions and with generally high levels of diastereoselectivity was achieved. This reaction demonstrates that previously underutilized unsaturated carbamates are good [Cu]-catalyzed diamination substrates. Sulfonamides, anilines, benzamide
A time-economical and robust synthesis of various selenofunctionalized heterocycles was accomplished via I2O5-mediated selenocyclizations of olefins with diselenides. Using this method, 116 selenomethyl-substituted heterocycles were synthesized with up to 97% isolated yield in minutes. Additional features of this new protocol include the use of an inorganic oxidant, mild conditions, and easy operation
通过I 2 O 5介导的烯烃与二硒化物的硒环化,实现了各种硒官能化杂环的经济且稳健的合成。使用这种方法,在几分钟内合成了 116 个硒甲基取代的杂环,分离产率高达 97%。这个新协议的其他特点包括使用无机氧化剂、温和的条件和易于操作。初步研究表明,这种转化是通过硒基碘诱导的亲电环化进行的。
Stereoselective synthesis of the isoxazolidine ring <i>via</i> manganese(<scp>iii</scp>)-catalysed aminoperoxidation of unactivated alkenes using molecular oxygen in air under ambient conditions
In this study, we developed a route for the tris(mono-ferrocene-functionalised β-diketonato) manganese(III)-complex catalysed diastereoselective oxygenative aminoperoxidation of unactivated alkenes using molecular oxygen in air. In the reaction, ethanol is used as a solvent, and it proceeds at room temperature under open air. Due to its wide range of substrate scope, functional tolerance, simple operation
在这项研究中,我们开发了一种利用空气中的分子氧对未活化烯烃进行三(单二茂铁-官能化 β-二酮)锰 ( III ) 络合物催化的非对映选择性含氧氨基过氧化反应的路线。该反应以乙醇为溶剂,在室温下露天进行。由于其广泛的底物范围、功能耐受性、操作简单以及温和环保的条件,该反应是一种很有前景的合成方法,可用于合成有价值的异恶唑烷环,不仅是天然产物中的特权结构,而且是 1,3- 的多功能合成子。氨基醇。
Oxidative Intramolecular Bromo-Amination of <i>N</i>-Alkenyl Sulfonamides via Umpolung of Alkali Metal Bromides
作者:Katsuhiko Moriyama、Yuta Izumisawa、Hideo Togo
DOI:10.1021/jo201113r
日期:2011.9.2
The oxidative intramolecular bromo-amination of various N-alkenyl sulfonamides and N-alkenoxyl sulfonamides via umpolung of alkali metal bromides occurred exo-selectively to generate cyclic bromoamides in high yields with good diastereoselectivities. This method provided the desired products without elaborating the stoichiometric amount of corresponding organic waste.
Palladium-Catalyzed Ring-Forming Alkene Aminoaroylation of Unsaturated Hydrazones and Sulfonamides
The first example of a Pd(OAc)(2)-catalyzed ring-forming alkene aminoaroylation of unsaturated hydrazones and sulfonamides is described. This protocol features the use of diaryliodonium salts as both oxidants and aryl sources, thus enabling mild reaction conditions, good chemoselectivity, a broad substrate scope, and high functional group tolerance. A wide range of synthetically and biologically important functionalized dihydropyrazoles and isoxazolidines have been obtained in good yields.