24052-14-0Relevant academic research and scientific papers
Oxalyl Boronates Enable Modular Synthesis of Bioactive Imidazoles
Lee, C. Frank,Holownia, Aleksandra,Bennett, James M.,Elkins, Jonathan M.,St. Denis, Jeffrey D.,Adachi, Shinya,Yudin, Andrei K.
, p. 6264 - 6267 (2017/05/19)
Described herein is the preparation of oxalyl boronate building blocks and their application for the construction of heterocycles. The oxalyl unit, readily accessible through commercially available starting materials, enables a modular approach for the synthesis of imidazoles. A variety of aromatic, heteroaromatic, and alkyl carboxaldehydes were condensed with oxalyl boronates to afford substituted boryl imidazoles in a regiocontrolled fashion. Subsequent palladium-catalyzed cross-coupling with haloarenes furnished the desired trisubstituted imidazole scaffolds. To demonstrate the utility of these scaffolds, potent inhibitors of the serine/threonine-protein kinase STK10 were synthesized.
Imidazole synthesis by transition metal free, base-mediated deaminative coupling of benzylamines and nitriles
Das, Uttam Kumar,Shimon, Linda J. W.,Milstein, David
supporting information, p. 13133 - 13136 (2017/12/26)
A transition metal free, straightforward synthetic method for the preparation of substituted imidazoles is reported herein. Base promoted, deaminative coupling of benzylamines with nitriles results in the one-step synthesis of 2,4,5-trisubstituted imidazoles with liberation of ammonia. This protocol provides a practical strategy for the synthesis of valuable imidazole derivatives from readily available starting materials.
Photocatalytic coupling of amines to imidazoles using a Mo-ZnIn2S4 catalyst
Wang, Min,Li, Lihua,Lu, Jianmin,Luo, Nengchao,Zhang, Xiaochen,Wang, Feng
, p. 5172 - 5177 (2017/11/09)
Substituted imidazoles are traditionally synthesized by co-condensation of multiple feedstocks. Herein, we report a new route for the synthesis of substituted imidazoles via photocyclization of readily available amines at room temperature. The reaction is achieved by the visible-light-induced C-C/C-N bond coupling and subsequent dehydrogenation reaction over Mo-ZnIn2S4 as a heterogeneous photocatalyst. A wide range of amines were converted into the corresponding tri- and tetra-substituted imidazoles with up to 96% total yields. The simplicity, high efficiency and mild condition merits of this new reaction will enable it to be useful in synthetic transformations.
REACTION OF HYDROXYMETHYL ARYL KETONES WITH AROMATIC HYDROCARBONS
Bal'on, Ya. G.,Smirnov, V. A.
, p. 1712 - 1715 (2007/10/02)
The readily obtainable products from the condensation of arylglyoxals with carboxamides react with benzene and its analogs in the presence of concentrated sulfuric acid or phosphorus pentoxide in trifluoroacetic acid with the formation of arylmethyl aryl ketones, which are used for the synthesis of substituted azoles.
1,3-Anionic Cycloadditions, XVII. Synthesis of Imidazolines and Imidazoles by Cycloaddition of 2-Azaallyllithium Compounds to Aromatic Nitriles
Kauffmann, Thomas,Busch, Alfred,Habersaat, Kai,Koeppelmann, Edgar
, p. 492 - 499 (2007/10/02)
1,3-Diphenyl-2-azaallyllithium (1c) reacts with aromatic nitriles by cycloaddition and subsequent dehydration to give lithiated imidazoles (3b). 1,1-Diphenyl-2-azaallyllithium (1a) under corresponding conditions gives either by cycloaddition lithiated imidazolines (2) or by normal addition lithiated open-chain enamines (5a, b).The enamines formed (4-amino-2-azabutadienes) are isolable in spite of their primary amino group. - Cycloaddition in preparatively useful yield was not possible with aliphatic nitriles.
