Manganese(<scp>iii</scp>)-promoted tandem phosphinoylation/cyclization of 2-arylindoles/2-arylbenzimidazoles with disubstituted phosphine oxides
作者:Shuai-Shuai Jiang、Yu-Ting Xiao、Yan-Chen Wu、Shu-Zheng Luo、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/d0ob00877j
日期:——
1-a]isoquinolin-6(5H)-ones through manganese(III)-promoted tandem phosphinoylation/cyclization of 2-arylindoles or 2-arylbenzimidazoles with disubstituted phosphineoxides was developed. In this transformation, new C–P bond and C–C bond were constructed simultaneously under silver-free conditions, exhibiting a broad substrate scope. It was noted that not only diarylphosphine oxides but also dialkyl and arylalkyl-phosphine
一种简单实用的方法,通过锰合成磷酸取代的吲哚[2,1 - a ]异喹啉-6(5 H)-和苯并咪唑[2,1 - a ]异喹啉-6(5 H)-。III)促进了双芳基膦酸酯或2-芳基苯并咪唑与双取代氧化膦的串联膦酰基化/环化反应。在这种转变中,在无银条件下同时构建了新的C–P键和C–C键,具有广泛的底物范围。注意到不仅二芳基膦氧化物,而且二烷基和芳基烷基膦氧化物也符合条件。
Synthesis of indolo[2,1-<i>a</i>]isoquinoline derivatives <i>via</i> visible-light-induced radical cascade cyclization reactions
We describe a photocatalyzed transformation for the synthesis of the indolo[2,1-a]isoquinoline core structure. This redox neutral reaction features mild reaction conditions and exceptional functional group tolerance. A series of valuable indolo[2,1-a]isoquinoline derivatives bearing various functional groups were synthesized using this method in good to excellent yields.
我们描述了吲哚[2,1- a ]异喹啉核心结构的合成的光催化转化。该氧化还原中性反应具有温和的反应条件和出色的官能团耐受性。使用该方法以良好至优异的产率合成了一系列带有各种官能团的有价值的吲哚[2,1- a ]异喹啉衍生物。
Base-promoted domino reaction for the synthesis of 2,3-disubstituted indoles from 2-aminobenzaldehyde/2-amino aryl ketones, tosylhydrazine, and aromatic aldehydes
A base-promoted domino reaction to synthesize the 2,3-disubstituted indoles from 2-aminobenzaldehyde/2-amino aryl ketones, tosylhydrazine, and aromaticaldehydes has been developed. This strategy provides a simple and beneficial way for the construction of 2,3-disubstituted indole compounds from readily available starting materials under mild conditions.
Considering their unique roles in organic synthesis, and pharmaceutical and agrochemical applications, the development of fluoroalkylation, cyclization, and indole oxidative cleavage are important topics. Herein, an unprecedented electrochemical tri‐ and difluoromethylation/cyclization/indole oxidative cleavage process occurring in an undivided cell is presented. The protocol employs a readily prepared
Catalyst-Controlled Divergent Reactions of 2,3-Disubstituted Indoles with Propargylic Alcohols: Synthesis of 3<i>H</i>-Benzo[<i>b</i>]azepines and Axially Chiral Tetrasubstituted Allenes
作者:Chenxiao Qian、Tingting Huang、Jianwei Sun、Pengfei Li
DOI:10.1021/acs.orglett.2c02642
日期:2022.9.9
Catalyst-controlled divergent reactions of 2,3-disubstituted indoles with propargylicalcohols were developed for the first time. In the presence of TsOH or B(C6F5)3 as catalyst, 2,3-disubstituted indoles reacted smoothly with 3-alkynyl-3-hydroxyisoindolinones to afford 3H-benzo[b]azepines by selective C2(sp2)–C3(sp2) ring expansion of indoles. In contrast, decreasing the catalyst strength (e.g., with
首次开发了由催化剂控制的 2,3-二取代吲哚与炔丙醇的发散反应。在TsOH或B(C 6 F 5 ) 3催化剂存在下,2,3-二取代吲哚类化合物与3-炔基-3-羟基异吲哚啉酮类化合物通过选择性C2(sp 2 )反应得到3 H-苯并[ b ]氮杂–C3(sp 2 ) 吲哚的扩环。相反,降低催化剂强度(例如,使用手性磷酸)会中断级联反应,从而产生带有相邻手性季碳立体中心的轴向手性四取代丙二烯。对照实验提供了对反应机理的见解。