Catalytic Reductive Synthesis and Direct Derivatization of Unprotected Aminoindoles, Aminopyrroles, and Iminoindolines
作者:Leonardus H. Leijendekker、Jens Weweler、Tobias M. Leuther、Jan Streuff
DOI:10.1002/anie.201702310
日期:2017.5.22
A titanium(III)-catalyzed radical cyclization to unprotected 3-aminoindoles, 3-aminopyrroles, or 3-iminoindolines is reported. The reaction is non-hazardous, scalable, and allows facile isolation of the free products by extraction. The method is demonstrated on a large substrate scope and it further allows the direct installation of various nitrogen protecting groups or the synthesis of building blocks
Development, Scope, and Applications of Titanium(III)-Catalyzed Cyclizations to Aminated N-Heterocycles
作者:Leonardus H. Leijendekker、Jens Weweler、Tobias M. Leuther、Daniel Kratzert、Jan Streuff
DOI:10.1002/chem.201805909
日期:2019.3.1
their synthesis by modern catalytic methods. This full paper presents the development and extended scope of the new cyclization methodology. The transformation of the products into fused bis‐indoles is also demonstrated along with the discovery of an unusual palladium‐catalyzed reductive biphenyl coupling reaction. The titanium(III)‐catalyzed cyclization has also been applied to the synthesis of substituted
Nucleophilic Addition of Hetaryllithium Compounds to 3-Nitro-1-(phenylsulfonyl)indole: Synthesis of Tetracyclic Thieno[3,2-c]-δ-carbolines
作者:Gordon W. Gribble、Philip E. Alford、Tara L. S. Kishbaugh
DOI:10.3987/com-09-s(s)99
日期:——
3-Nitro-1-(phenylsulfonyl)indole undergoes addition of aryl- and hetaryllithium nucleophiles to produce 2-substituted-3-nitroindoles. Mild reductive―acylation provides excellent access to 3-amido-2-hetarylindoles from which new thieno[3,2-c]-δ-carbolines are synthesized by cyclodehydration.
Synthesis of 11H-indolo[3,2-c]quinolines by SnCl4-catalyzed cyclization of indole-3-carbaldehyde oximes
作者:N. A. Aksenov、A. Z. Gasanova、F. Yu. Prokonov、D. A. Aksenov、G. M. Abakarov、A. V. Aksenov
DOI:10.1007/s11172-019-2697-7
日期:2019.12
A new method for synthesizing 11H-indolo[3,2-c]quinolines by SnCl4-catalyzed intramolecular electrophilic amination of 2-arylindole-3-carbaldehyde O-acetyl oximes was developed.
Synthesis of 3-indolylimines from 3-acetamido-2-phenylindole
作者:Ji Qu、Daniel S. Wenholz、Naresh Kumar、David StC. Black
DOI:10.1016/j.tet.2020.131224
日期:2020.6
(C) 2020 Elsevier Science. All rights reserved Treatment of 3-acetamido-2-phenylindole with phosphoryl chloride generates an iminium chloride (or related) electrophile that can react with suitable indole nucleophiles at C3, C7 or C2 to form di-indolylketimines in moderate yield. Similar reactions of the diacetyl derivative of 2-aminobenzylalcohol give related mono-indolylketimines.(C) 2020 Elsevier Ltd. All rights reserved.