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
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
Visible‐Light‐Induced [2+2+1] Dearomative Cascade Cyclization of Indole/Furan Alkynes to Synthesize Sulfonyl Polycycles
作者:Jiajun Luo、Guohui Zeng、Xiaohui Cao、Biaolin Yin
DOI:10.1002/adsc.202200331
日期:2022.7.5
visible-light-induced [2+2+1] dearomativecascade cyclization of indole/furan alkynes with NaHSO3, providing an array of diverse highly strained sulfonyl polycycles. Compared to our previous work, this method does not require the use of additional sacrificial oxidants and have wider reaction scope. Preliminary mechanistic studies suggest that the indole moiety initiated the reaction, which proceeded via single-electron
The direct utilization of amines for C–C bond formation without prefunctionalization remains a significant challenge. Herein, we report the base-promoted deaminative coupling of gramines with aminomalaimides under redox-neutral conditions. In this operationally simple reaction, a series of indolmethyl-substituted aminomaleimides that emitted fluorescence were synthesized in good-to-excellent yields