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。
Rhodium-Catalyzed Diastereo- and Enantioselective Tandem Spirocyclization/Reduction of 3-Allenylindoles: Access to Functionalized Vinylic Spiroindolines
作者:Christian P. Grugel、Bernhard Breit
DOI:10.1021/acs.orglett.9b03835
日期:2019.12.6
A highly selective rhodium-catalyzed tandem spirocyclization/reduction of 3-allenylindoles is reported. By employing a Hantzsch ester as reductant, vinylic spiroindolines are obtained in excellent yields as well as diastereo- and enantioselectivity. In addition, the reaction’s synthetic utility is highlighted by broad functional group compatibility and exemplified by a gram scale reaction with subsequent
The invention features compounds of the general formula:
in which the variable groups are as defined herein, and to their preparation and use.
该发明涉及一般式化合物:其中变量基团如本文所定义,以及它们的制备和使用。
Enantioselective Gold-Catalyzed Allylic Alkylation of Indoles with Alcohols: An Efficient Route to Functionalized Tetrahydrocarbazoles
作者:Marco Bandini、Astrid Eichholzer
DOI:10.1002/anie.200904388
日期:2009.12.7
Breaking the taboo: The direct use of allylicalcohols in catalytic and enantioselective Friedel–Crafts alkylation is described for the first time in the presence of chiral gold complexes. This intramolecular Friedel–Crafts reaction was used to prepare a broad range of functionalized tetrahydrocarbazoles (see scheme; X=Me, F, Br, Cl, OMe; R=Me, Et, tBu; R′=H, Me).
打破禁忌:在手性金配合物的存在下,首次首次描述了在催化和对映选择性的Friedel-Crafts烷基化反应中直接使用烯丙醇。该分子内Friedel-Crafts反应用于制备范围广泛的官能化四氢咔唑(参见方案; X = Me,F,Br,Cl,OMe; R = Me,Et,t Bu; R'= H,Me)。
I<sub>2</sub>-induced cascade cyclization and dearomatization of indoles for the highly efficient synthesis of iodinated and vinylic spiroindolenines
作者:Xiaohui Wei、Xuewu Liang、Yazhou Li、Qi Liu、Xuyi Liu、Yu Zhou、Hong Liu
DOI:10.1039/d1gc02713a
日期:——
framework is a privileged heterocyclic motif and is widely present in numerous indole alkaloids. Herein, we develop a metal-free and environmentally friendly approach for the intramolecular cascade cyclization and dearomatization of indole derivatives to selectively afford iodinated and vinylic spiroindolenines by a substrate-controlled strategy. Simple operation, mild conditions, and high yield make this