An entry to indole quinones using in situ generated nitrobenzoquinone
作者:Huangchao Yu、George A. Kraus
DOI:10.1016/j.tetlet.2018.02.072
日期:2018.4
A direct synthesis of polycyclic indoles from nitrohydroquinone and indoles is reported. Pentacyclic adducts can be obtained by a tandem conjugate addition/Diels-Alder strategy.
Dearomative Indole (3 + 2) Reactions with Azaoxyallyl Cations – New Method for the Synthesis of Pyrroloindolines
作者:Maria C. DiPoto、Russell P. Hughes、Jimmy Wu
DOI:10.1021/jacs.5b10221
日期:2015.12.2
report the first examples of the synthesis of pyrroloindolines by means of (3 + 2) dearomative annulation reactions between 3-substituted indoles and highly reactive azaoxyallyl cations. Computational studies using density functional theory (DFT) (B3LYP-D3/6-311G**++) support a stepwise reaction pathway in which initial C–C bond formation takes place at C3 of indole, followed by ring closure to give
herein for the simple, convenient and efficient oxidation of indoles to isatins using pyridinium chlorochromate with the aid of polyaniline salt catalyst at room temperature or at reflux in dichloroethane. Interestingly, oxidation of 3-alkyl indoles by this procedure gave 3-hydroxy 3-alkyl oxindoles. On the other hand, indol-3-alkanols gave mixtures of isatins and 3-formyl indoles. This is the first example
Electrochemical C−H Amidation of Heteroarenes with<i>N</i>‐Alkyl Sulfonamides in Aqueous Medium
作者:Yan Zhang、Zhipeng Lin、Lutz Ackermann
DOI:10.1002/chem.202004229
日期:2021.1.4
The construction of C−N bonds by free radical reactions represents a powerful synthetic approach for direct C−Hamidations of arenes or heteroarenes. Developing efficient and more environmentally friendly synthetic methods for C−Hamidationreactions remains highly desirable. Herein, metal‐free electrochemical oxidative dehydrogenative C−Hamidations of heteroarenes with N‐alkylsulfonamides have been
Catalyst-Controlled Regiodivergence in Rearrangements of Indole-Based Onium Ylides
作者:Vaishnavi N. Nair、Volga Kojasoy、Croix J. Laconsay、Wang Yeuk Kong、Dean J. Tantillo、Uttam K. Tambar
DOI:10.1021/jacs.1c00283
日期:2021.6.23
metal-coordinated ion-pair in the copper catalyzed [1,2]-rearrangement that recombines in the solvent-cage. The application of our methodology was demonstrated in the first total synthesis of the indole alkaloid (±)-sorazolon B, which enabled the stereochemical reassignment of the natural product. Further functional group transformations of the rearrangement products to generate valuable synthetic intermediates
我们开发了由吲哚底物衍生的鎓叶立德的催化剂控制区域发散重排。由取代的吲哚原位形成的氧鎓叶立德分别在铑和铜催化剂存在下选择性地进行[2,3]-和[1,2]-重排。实验和密度泛函理论 (DFT) 相结合的计算研究表明,不同的机制途径涉及铑催化反应中的无金属叶立德有利于 [2,3]-重排,以及铜催化反应中的金属配位离子对 [1 ,2]-在溶剂笼中重新组合的重排。我们的方法的应用在吲哚生物碱 (±)-sorazolon B 的首次全合成中得到了证明,这使得天然产物的立体化学重新分配成为可能。还展示了重排产物的进一步官能团转化以产生有价值的合成中间体。