Acetic acid functionalized ionic liquid systems: An efficient and recyclable catalyst for the regioselective ring opening of epoxides with NaN3

Abstract

In the present study, an environmentally benign, efficient, and solvent-free procedure was developed for the synthesis of 1,2-azidoalcohols by the regioselective ring opening of some epoxides with sodium azide (NaN 3 ) in the presence of an acetic acid functionalized imidazolium salt [Cmmim]BF 4 or [Cmmim]Br as a green and Brønsted acidic ionic liquid (BAIL) catalyst under mild and neutral reaction conditions at 60 C. The remarkable features of this procedure are excellent regioselectivity, simple work-up procedure, high yields of products, short reaction times, and ease of recyclability of ionic liquids.

Azidative Aromatization of Quinone Methides Under Transition Metal and Solvent Free Conditions

“…The main goal of green chemistry is to avoid the use of toxic solvents and reagents, avoid the high cost of preparing catalysts, and reduce the costs associated with organic synthesis Accordingly, the development of metal and solvent‐free reactions should be of priority from the standpoint of green chemistry. Moreover, running a reaction under solvent‐free condition also leads to novel modes of transformations and produces unique reactivity. Therefore, we decided to perform the reaction in the absence of an organic solvent.…”

Fe3O4@APTES@isatin-SO3H as heterogeneous and efficient catalyst for the synthesis of quinoxaline derivatives

“…In addition, quinoxaline derivatives are used in industry, in dyes, fluorescent dyes, materials having electroluminescence properties and in the synthesis of organic semiconductors [24]. The methods reported in the literature for the synthesis of quinoxaline utilize various catalytic systems such as ultrasonic [25], CuSO 4 .5H 2 O (II) [26], catalyst-free [27], Si/MCM-41 [28], phosphor sulfonic acid [29], boron sulfonic acid [30], (NH 4 ) 6 Mo 7 O 24 .4H 2 O [31], bismuth (III) triflate [32], ammonium chloride [33], and Zn(L-proline) [34].…”

2‐Methyl‐1,3‐disulfoimidazolium polyoxometalate hybrid catalytic systems as equivalent safer alternatives to concentrated sulfuric acid in nitration of aromatic compounds

“…The Brønsted and Lewis acidic sites of hybrid materials are associated with POMs and the metal ions of their frameworks. Thus combining all their structural changes and newly added unique physical/chemical properties of ionic liquids makes POMs water‐tolerant and recyclable heterogeneous catalysts. This concept of organic–inorganic hybrids has been employed to synthesize a new class of task‐specific ionic liquid‐based POM salts by pairing of anionic POMs with or without functional group‐tethered organic cations .…”