Reduction of bis(5-alkyl-2-furyl)(2-nitroaryl)methane with aqueous titanium trichloride solution
作者:Dong-Kun Li、Jing-Yi Tan、Wei Deng、Zheng-Yang Xu
DOI:10.1016/j.tet.2021.132407
日期:2021.10
In this article, we introduces a new method for the synthesis of substituted indole by reductive recyclization of bis(5-alkyl-2-furyl)(2-nitroaryl)methane. Bis(5-alkyl-2-furyl)(2-nitroaryl)methane undergo reduction to provide indole or aniline. In the process of research, we found that the chemoselecitivity of reduction was controlled by subtle differences in the electronic effects of the substrate
Alkylation of heteroarenes by using aldehydes is a direct approach to increase molecular complexity, which however often involves the use of stochiometric oxidant, strong acid, and high temperature. This study concerns an energy-efficient electrochemical alkylation of heteroarenes by using aldehydes undermildconditions without mediators. Interestingly, the graphite anode can trigger aldehyde cationic
Furan ring opening–indole ring closure: SnCl2-induced reductive transformation of difuryl(2-nitroaryl)methanes into 2-(2-acylvinyl)indoles
作者:Maxim G. Uchuskin、Natalia V. Molodtsova、Vladimir T. Abaev、Igor V. Trushkov、Alexander V. Butin
DOI:10.1016/j.tet.2012.03.069
日期:2012.6
2-(2-acylvinyl)-3-(5-alkyl-2-furyl)indoles by reductive recyclization of bis(5-alkyl-2-furyl)(2-nitroaryl)methanes is reported. This transformation was carried out by heating the substrates with SnCl2·2H2O in ethanol. The intermediate nitrosoarene moiety interacted with the furan ring via electrophilic nitrogen attack onto the C(2) position of the furan ring. It was shown that the related bis(5-alkyl
Intramolecular Pd-Catalyzed Reductive Amination of Enolizable sp<sup>3</sup>-C–H Bonds
作者:Russell L. Ford、Isabel Alt、Navendu Jana、Tom G. Driver
DOI:10.1021/acs.orglett.9b03458
日期:2019.11.1
A palladium-catalyzed reductive cyclization of nitroarenes has been designed to construct sp3-C–NHAr bonds from sp3-C–H bonds by using an enolizable nucleophile to intercept a nitrosoarene intermediate. Exposure of ortho-substituted nitroarenes to 5 mol % of Pd(OAc)2 and 10 mol % of phenanthroline under 2 atm of CO constructs partially saturated 5-, 6-, or 7-membered N-heterocycles using α-pyridyl
Furan ring opening - indole ring closure: Synthesis of furo[2′,3′:3,4]-cyclohepta[1,2-<i>b</i>]indolium chlorides
作者:Alexander V. Butin、Sergey K. Smirnov、Tatyana A. Stroganova
DOI:10.1002/jhet.5570430315
日期:2006.5
2-acetylaminoaryldifurylmethanes or 2-aminoaryldifurylmethanes under treatment with methanolic HCl solution. The reaction proceeds in three steps: recyclization, intramolecular cyclization, and disproportionation. In this case the furanring takes part in building up both pyrrole and seven-membered rings. The same salts can be obtained directly from 2-acetylaminobenzaldehydes and 2-methylfuran under similar
从2-乙酰氨基芳基二呋喃甲烷甲烷或2-氨基芳基二呋喃甲烷甲烷经HCl甲醇溶液处理,详细阐述了呋喃[2',3':3,4]环庚[1,2- b ]吲哚氯化物的新合成方法。反应按三个步骤进行:再循环,分子内环化和歧化。在这种情况下,呋喃环参与构建吡咯和七元环。可以在类似条件下直接从2-乙酰氨基苯甲醛和2-甲基呋喃获得相同的盐,而无需分离相应的2-乙酰氨基芳基二呋喃甲烷。