Synthesis of 1,2,3-triazoles linked into chains with other carbo- and heterocycles by a reaction between β-azolyl enamines and azides
作者:Ilya V. Efimov、Nikolai A. Beliaev、Vasiliy A. Bakulev、Tetyana V. Beryozkina
DOI:10.1007/s10593-018-2249-3
日期:2018.2
The reactions of β-azolyl enamines with azides proceeded under solvent-free conditions in the absence of base at 110°С by one of the possible routes, selectively forming 1,4-disubstituted 1,2,3-triazoles. The proposed reaction mechanism includes cycloaddition of the starting reagents, leading to 1,2,3-triazoline intermediates, followed by elimination of dimethylamine and the formation of aromatic triazole
Synthesis and spectroscopic properties of rotamers in the series of 2-(fluoroaryl)-4-substituted pyrroles
作者:Almira R. Miftyakhova、Maria D. Matveeva、Dmitry I. Zhilyaev、Oleg S. Eltsov、Giovanni Talarico、Alexander F. Smol'yakov、Leonid G. Voskressensky、Ilya V. Efimov
DOI:10.1016/j.jfluchem.2021.109863
日期:2021.9
A mild, simple and efficient method for the synthesis of ortho, meta and para-fluoroaryl substituted pyrroles was discovered. It was found by NMR spectroscopy, that ortho-fluoroaryl substituted pyrroles exist in the form of inhibited conformational isomers (rotamers). Intramolecular interaction of the hydrogen atom of the pyrrole ring and the fluorine atom in the ortho-position of the aryl substituent
发现了一种温和、简单、有效的合成邻、间和对氟芳基取代吡咯的方法。通过NMR光谱发现,邻-氟芳基取代的吡咯以受抑制的构象异构体(旋转异构体)的形式存在。吡咯环的氢原子和芳基取代基邻位氟原子的分子内相互作用导致在1 H 和13 C NMR 光谱中出现两组信号。基于 2D HMBC 和 HSQC NMR 光谱的组合,以及 DMSO 和 CDCl 3 中温度相关的 NMR 实验 我们得出结论,获得的旋转异构体的比率是永久性的,与温度无关。