C S and C N bond formation via Mn-promoted oxidative cascade reaction: Synthesis of C3-sulfenated indoles
作者:Lin He、Xianwei Li
DOI:10.1016/j.tet.2017.09.003
日期:2017.10
Thioethers are of synthetic value in pharmaceutical molecules and nature products, herein, we report an oxidative cascade reaction that delivers multiple substituted indole thioethers with great efficiency. This transformation utilized ortho-azido aromatic alkynes as the substrates, and sulfonyl hydrazides as the sulfenation reagent promoted by Mn(III) catalyst. Notably, great functional group tolerance
Transition-metal-free, visible-light induced cyclization of arylsulfonyl chlorides with o-azidoarylalkynes: a regiospecific route to unsymmetrical 2,3-disubstituted indoles
作者:Lijun Gu、Cheng Jin、Wei Wang、Yonghui He、Guangyu Yang、Ganpeng Li
DOI:10.1039/c6cc10305g
日期:——
A visible-light-catalyzed synthesis of unsymmetrical 2,3-diaryl-substituted indoles from arylsulfonyl chlorides and o-azidoarylalkynes at room temperature has been discovered. This transformation exhibits excellent substrate scope and functional group tolerance. The use of inexpensive eosin Y as the catalyst with easy operation makes this protocol very practical.
A novel method for the formation of indole derivatives via gold-catalyzed tandem reactions of 2-alkynyl arylazides and oxygen-containing heterocycles has been developed. A variety of indole derivatives were prepared under mild reaction conditions.
A self-relay rhodium(I)-catalyzed cyclization of alkyne–azides with two σ-donor/π-acceptor ligands (isonitriles and CO) to form sequentially multiple-fused heterocycle systems via tandem nitrene transformation and aza-Pauson–Khand cyclization has been developed. In this approach, an intriguing chemoselective insertion process of isonitriles superior to CO was observed. This reaction provides an alternative
具有两个σ-供体/π-受体配体(腈和CO)的自中继铑(I)催化的炔-叠氮化物的环化反应通过串联氮转化和氮杂-Pauson-Khand环化反应依次形成多重稠合杂环系统已开发。在这种方法中,观察到了一种优于CO的有趣的异腈化学选择性插入过程。该反应提供了合成功能化吡咯并[2,3- b ]吲哚支架的替代策略。
Synthesis of <i>N</i>
-Fused Seven-Membered Indoline-3-ones <i>via</i>
a Palladium-Catalyzed One-Pot Insertion Reaction from 2-Alkynyl Arylazides and Cyclic <i>β</i>
-Diketones
A novel insertion reaction of cyclic C‐acylimines into cyclic β‐diketones to construct N‐fused seven‐membered multifunctional polycyclic indoline‐3‐one derivatives has been described, which has shown good tolerance of various functional groups. The corresponding products were obtained in moderate to good yields under mild reaction conditions.