base and ligand free copper catalyzed method for the construction of trifluoromethylated benzoxazines has been developed by using Umemoto's reagent. It involves the oxidative difunctionalization of alkenes through tandem C–O and C–CF3 bond formations. Furthermore, synthesized benzoxazines were selectively converted into trifluoromethylated allylic and (E)-vinylic benzamides by the treatment of KOtBu
通过使用梅本试剂开发了一种简单的无碱和无配体铜催化的三氟甲基化苯并恶嗪的构建方法。它涉及通过串联的C–O和C–CF 3键形成烯烃的氧化双官能团。此外,通过分别处理KO t Bu和CH 3 Li,将合成的苯并恶嗪选择性地转化为三氟甲基化的烯丙基和(E)-乙烯基苯甲酰胺。
Copper-catalyzed radical cascade oxyalkylation of olefinic amides with simple alkanes: highly efficient access to benzoxazines
A copper-catalyzedC(sp3)–H bondfunctionalization of simple alkanes with olefinic amides was developed for the efficient synthesis of important benzoxazine derivatives. It involves new C-C and C-O bondformation in one step via radical cascade process.
A new, efficient, and practical radical cyclization of olefinic amides with ketones through α-C(sp3)–H functionalization in the presence of tert-butyl peroxybenzoate (TBPB) is described for the first time. This protocol assembles a wide range of pivotal and useful benzoxazines in good to excellent yields under mild, catalyst-free, ligand-free, and base-free conditions with wide functional group tolerance
A Fluorination/Aryl Migration/Cyclization Cascade for the Metal-Free Synthesis of Fluoro-Benzoxazepines
作者:Anna Ulmer、Christoph Brunner、Andreas M. Arnold、Alexander Pöthig、Tanja Gulder
DOI:10.1002/chem.201504749
日期:2016.3.7
applications across chemical and medical disciplines. Efficient methods for the synthesis of such compounds are thus needed. Within this work, application of the bench‐stable cyclic hypervalent iodine(III) fluoro reagent 1 facilitated the development of an efficient, metal‐free method for the preparation of the novel class of 4‐fluoro‐1,3‐benzoxazepines starting from readily available styrenes. The efficacy
Persulfate-activated charcoal mixture: an efficient oxidant for the synthesis of sulfonated benzo[<i>d</i>][1,3]oxazines from <i>N</i>-(2-vinylphenyl)amides and thiols in aqueous solution
作者:Palani Natarajan、Priya、Deachen Chuskit
DOI:10.1039/d1ra02377b
日期:——
A series of 2,4-aryl-4-((arylsulfonyl)methyl)-4H-benzo[d][1,3]oxazines in good to excellent yields have directly been obtained from N-(2-vinylphenyl)amides and thiols by employing a mixture of K2S2O8-activated charcoal in aqueous acetonitrile solution at 50 °C. A plausible mechanism for the reaction is reported. It reveals that the reaction follows a radical pathway and the persulfate has been the
从N- ( 2-乙烯基苯基)酰胺和通过在 50 °C 下使用 K 2 S 2 O 8活性炭在乙腈水溶液中的混合物制备硫醇。报道了该反应的合理机制。这表明该反应遵循自由基途径,过硫酸盐一直是产物中形成砜基团的氧源。值得一提的是,该协议采用了易于访问的 K 2 S 2 O 8- 活性炭混合物和硫醇,首次分别作为氧化剂和磺酰化前体。