Efficient indoles and anilines syntheses employing tert-butyl sulfinamide as ammonia surrogate
摘要:
tert-Butyl sulfinamide is an ammonia equivalent for the palladium-catalyzed amination of aryl bromides and aryl chlorides. Using these amine derivatives, it has been observed that indoles and anilines with sensitive functional groups can be readily prepared. This surrogate has also been used for the synthesis of indoles from 2-halophenols using palladium catalyzed cross coupling reaction as the key step. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of Divergent Benzo[<i>b</i>]fluorenones through Cycloaromatization Reactions of 1,5-Enynols and 1,5-Diynols
作者:Bingyu Yan、Yang Fu、Hui Zhu、Zhiyuan Chen
DOI:10.1021/acs.joc.9b00231
日期:2019.4.5
A facile and efficient synthesis of divergent benzo[b]fluorenones is described through the use of dichlorobenzoquinone-promoted oxidative cycloaromatization reactions of acyclic 1,5-enynols and 1,5-diynols. The success of these cascadereactions depends on the chemoselectivity of the initial Meyer–Schuster rearrangement to produce allenol intermediate, which is followed by regioselective Schmittel
通过使用二氯苯醌促进的无环1,5-烯醇和1,5-二炔醇的氧化环芳构化反应,描述了发散的苯并[ b ]芴酮的简便高效合成方法。这些级联反应的成功取决于初始Meyer-Schuster重排产生烯丙醇中间体的化学选择性,随后是区域选择性的Schmittel环化反应,以及随后的Friedal-Crafts烷基化反应或末端Ar部分的自由基进攻。反应中仅需要氧化剂和溶剂,因此在不含金属的条件下提供了一个小的库,具有所需的具有优异的官能团耐受性的预期多碳环产物。选定的苯并[ b]的吸收和光致发光特性还研究了芴酮。结果表明,在苯基部分包含给电子体4-OMe基团的化合物(2h)显示出深绿色发射光(491nm)。
Palladium-Catalyzed C–S Coupling: Access to Thioethers, Benzo[<i>b</i>]thiophenes, and Thieno[3,2-<i>b</i>]thiophenes
作者:Marius Kuhn、Florian C. Falk、Jan Paradies
DOI:10.1021/ol2016093
日期:2011.8.5
formation/cross-coupling/cyclization domino reaction using thiourea as a cheap and easy to handle dihydrosulfide surrogate has been developed. Structurally important biarylthioether, benzo[b]thiophenes, and thieno[3,2-b]thiophene scaffolds are provided in high yield.
已经开发出了第一个使用硫脲作为便宜且易于处理的二氢硫代用品的C-S键形成/交叉偶联/环化多米诺反应。以高收率提供结构上重要的联芳基硫醚,苯并[ b ]噻吩和噻吩并[3,2- b ]噻吩支架。
Copper-catalysed bromoalkynylation of arynes
作者:Takami Morishita、Hiroto Yoshida、Joji Ohshita
DOI:10.1039/b919301d
日期:——
Arynes were found to be inserted into a C(sp)–Br σ-bond of bromoalkynes in the presence of a copper catalyst, giving (alkynyl)bromoarenes in a straightforward manner.
Application of Isocyanides as Amide Surrogates in the Synthesis of Diverse Isoindolin-1-one Derivatives by a Palladium-Catalyzed Tandem Carboxamidation/Hydroamidation Reaction
作者:Ramdas S Pathare、Shivani Sharma、Sathish Elagandhula、Vaishali Saini、Devesh M Sawant、Monika Yadav、Ashoke Sharon、Shahnawaz Khan、Ram T Pardasani
DOI:10.1002/ejoc.201600999
日期:2016.11
The rapid synthesis of the isoindolinone skeleton has been accomplished by a palladium-catalyzed one-pot tandem process, which consists of an isocyanideinsertion/hydration (carboxamidation) and 5-exo-dig cycloisomerization (hydroamidation) reaction sequence that afforded the products in good to excellent yields. Preliminary mechanistic studies of this sequential C–C/C–O/C–N bond formation process
DDQ-Mediated Oxidative Radical Cycloisomerization of 1,5-Diynols: Regioselective Synthesis of Benzo[<i>b</i>]fluorenones under Metal-Free Conditions
作者:Hui Zhu、Zhiyuan Chen
DOI:10.1021/acs.orglett.5b03533
日期:2016.2.5
has been developed. The reaction proceeds under metal-free reaction conditions with high efficiency and broad functional group tolerance, which offers a general and straightforward access to benzo[b]fluorenones under metal-free conditions. The preliminary mechanistic studies revealed the possible involvement of a Meyer–Schuster rearrangement combined with an oxidative radical cyclization.
已经开发了无环1,5-二炔醇的区域和化学选择性氧化环异构化反应。该反应在无金属的反应条件下进行,具有较高的效率和宽泛的官能团耐受性,这为在无金属的条件下提供一般直接的苯并[ b ]芴酮的途径。初步的机理研究表明,梅尔-舒斯特重排与氧化自由基环化相结合的可能性。