Bis(p-fluorophenylethynyl) derivatives were obtained by the reaction of bisbromoaromatic compounds with p-fluorophenylacetylene in the presence of a Pd catalyst. Subsequent oxidation of these products using an I-2-DMSO system led to new bis(p-fluorophenylglyoxalyl)ketones, alpha-diketones, and heterocyclic compounds.
Synthesis of new bis[p-(phenylethynyl)phenyl]hetarylenes and bis[p-(phenylglyoxalyl)phenyl]hetarylenes
作者:M. L. Keshtov、A. L. Rusanov、N. M. Belomoina、A. K. Mikitaev、G. B. Sarkisyan、M. M. Begretov
DOI:10.1007/bf01430752
日期:1996.9
A series of new bis[p-(phenylethynyi)phenyl]hetarylenes was obtained by cross-coupling between heteroaromatic dibromides and phenylacetylene catalyzed by phosphine complexes of palladium in the presence of Cul and an organic base. Bis[p-(phenylethynyl)phe-nyl]hetarylenes were oxidized to the corresponding bis[p-(phenylglyoxalyl)phenylihetarylenes using the I2-DMSO system.
TMSOTf-catalyzed synthesis of trisubstituted imidazoles using hexamethyldisilazane as a nitrogen source under neat and microwave irradiation conditions
作者:Kesatebrhan Haile Asressu、Chieh-Kai Chan、Cheng-Chung Wang
DOI:10.1039/d1ra05802a
日期:——
In the process of drug discovery and development, an efficient and expedient synthetic method for imidazole-based small molecules from commercially available and cheap starting materials has great significance. Herein, we developed a TMSOTf-catalyzed synthesis of trisubstituted imidazoles through the reaction of 1,2-diketones and aldehydes using hexamethyldisilazane as a nitrogen source under microwave
在药物发现和开发过程中,一种高效便捷的以市售廉价起始原料合成咪唑基小分子的方法具有重要意义。在此,我们利用六甲基二硅氮烷作为氮源,在微波加热和无溶剂条件下,通过 1,2-二酮和醛的反应开发了 TMSOTf 催化合成三取代咪唑。使用 X 射线单晶衍射分析证实了代表性三取代咪唑的化学结构。这种合成方法有几个优点,包括温和的路易斯酸的参与,不含金属和添加剂,底物范围广,收率好至极好,反应时间短。此外,
Improved synthesis of bis[p-(phenylethynyl)phenyl]hetarylenes
作者:M. L. Keshtov、A. L. Rusanov、N. M. Belomoina、A. K. Mikitaev
DOI:10.1007/bf02495139
日期:1997.10
Bis[p-(phenylethynyl)phenyl]hetarylenes were synthesized in high yields by an improved method using cross-coupling between phenylacetylene and 4,4′-dibromobenzil followed by condensation of the 4,4′-di(phenylethynyl)benzil obtained with eithero-phenylenediamine and 3,4-diaminobenzoic acid or with benzaldehyde andp-nitrobenzaldehyde in the presence of ammonium acetate.
Bredereck et al., Chemische Berichte, 1959, vol. 92, p. 329,335
作者:Bredereck et al.
DOI:——
日期:——
Molecular iodine/DMSO mediated oxidation of internal alkynes and primary alcohols using a one-pot, two step approach towards 2,4,5-trisubstituted imidazoles: Substrate scope and mechanistic studies
作者:Shivani Naidoo、Vineet Jeena
DOI:10.1016/j.tet.2020.131028
日期:2020.3
An efficient, eco-friendly and practical oxidation of internal alkynes and primary alcohols as key steps towards the synthesis of 2,4,5-trisubstituted imidazoles is reported. This green synthetic methodology employed an acid and metal-free molecular iodine/DMSO system, to afford a variety of substituted imidazoles in moderate to good yields, with a range of functionalities tolerated. Mechanistic studies revealed two distinct oxidation pathways, which ultimately form the diketone and aldehyde that serve as key intermediates in the multicomponent domino synthesis. (C) 2020 Elsevier Ltd. All rights reserved.