Novel Approach for the Synthesis ofN-Substituted Pyrroles Starting Directly from Nitro Compounds in Water
摘要:
A novel approach for a facile high-yielding synthesis of N-substituted pyrroles has been discovered by the treatment of nitroarenes with 2,5-dimethoxytetrahydrofuran using indium in dilute aqueous HCl at room temperature.
Abstract Phosphorous pentoxide is the catalyst of choice for the facile conversion of primary amines, aromatic amines, sulfonamides and primary amides into the corresponding N-substitutedpyrroles from 2,5-dimethoxytetrahydrofuran.
Design of an Indolylphosphine Ligand for Reductive Elimination-Demanding Monoarylation of Acetone Using Aryl Chlorides
作者:Wai Chung Fu、Chau Ming So、Wing Kin Chow、On Ying Yuen、Fuk Yee Kwong
DOI:10.1021/acs.orglett.5b02344
日期:2015.9.18
elimination-demanding Pd-catalyzed mono-α-arylation of acetone is demonstrated and reported. The catalyst is tolerant of previously proven challenging electron-deficient aryl chlorides and provides excellent product yields with down to 0.1 mol % Pd. Preliminary investigations suggest that the rate-limiting step for the proposed system is the oxidative addition of aryl chlorides, in which it contradicts
l-(+)-Tartaric acid and choline chloride based deep eutectic solvent: An efficient and reusable medium for synthesis of N-substituted pyrroles via Clauson-Kaas reaction
作者:Ping Wang、Fei-Ping Ma、Zhan-Hui Zhang
DOI:10.1016/j.molliq.2014.07.015
日期:2014.10
l-(+)-Tartaric acid–choline chloride based deep eutectic solvent has been found to be an effective promoted medium for Clauson-Kaas reaction of aromatic amines and 2,5-dimethoxytetrahydrofuran. Structurally diverse N-substituted pyrroles were obtained in high to excellent yields under mild conditions. The deep eutectic solvent is inexpensive, non-toxic, reusable and biodegradable.
Solvent Free Synthesis of N‐Substituted Pyrroles Catalyzed by Calcium Nitrate
作者:Rucha R. Wani、Hemchandra K. Chaudhari、Balaram S. Takale
DOI:10.1002/jhet.3507
日期:2019.4
Moderated and mild way for synthesizing N‐substituted pyrrole has been demonstrated herein. No solvents need to be used for this reaction, and instead, reactants themselves acted as a reaction medium. In fact, the reaction is carried out using catalytic amount of Ca(NO3)2.4H2O. The reaction conditions are selective and mild that helped to tolerate a wide variety of functional groups to give the desired
Facile, efficient and eco-friendly synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles
作者:Bruna L. Kuhn、Margiani P. Fortes、Teodoro S. Kaufman、Claudio C. Silveira
DOI:10.1016/j.tetlet.2014.01.101
日期:2014.2
A concise, two-step eco-friendly approach towards the synthesis of 5-sulfenyl tetrazole derivatives of indoles and pyrroles, is reported. The synthesis comprises the oxone-mediated thiocyanation of the starting heterocycles towards intermediate 3-thiocyanato indoles and 2-thiocyanato pyrroles, and their subsequent treatment with sodium azide in 2-propanol/water under zinc bromide promotion.