Natural Compounds and Their Structural Analogs in Regio- and Stereoselective Synthesis of New Families of Water-Soluble 2H,3H-[1,3]thia- and -Selenazolo[3,2-a]pyridin-4-ium Heterocycles by Annulation Reactions
作者:Vladimir A. Potapov、Roman S. Ishigeev、Irina V. Shkurchenko、Sergey V. Zinchenko、Svetlana V. Amosova
DOI:10.3390/molecules25020376
日期:——
products with opposite regiochemistry. Synthesis of new families of 2H,3H-[1,3]thia- and -selenazolo[3,2-a]pyridin-4-ium heterocycles has been developed by annulation reactions of 2-pyridinechalcogenyl halides with natural compounds (eugenol, isoeugenol, methyl eugenol, methyl isoeugenol, acetyl eugenol, trans-anethole) and their structuralanalogs. The influence of the substrate structure and the nature
Numerous areneselenenamides derived from ammonia, primary and secondary amines and two N,N-bis(arylseleno)alkylamines have been studied. The selenenamides bearing an electron-withdrawing substituent on the aromatic moiety are stable. The 1H, 13C and 77Se chemical shifts and some coupling constants are reported. For N.N-dialkyl-o-nitrobenzeneselenenamides, the 77Se NMR and the 17O NMR give evidence of an Se-O interaction. In N-alkyl derivatives, a hydrogen bond between the amine group and the ortho-substituent is proposed to explain the deshielding of the selenium nucleus.
Adducts of 2-Pyridylselenenyl Halides and Nitriles as Novel Supramolecular Building Blocks: Four-Center Se···N Chalcogen Bonding versus Other Weak Interactions
作者:Mariya V. Grudova、Victor N. Khrustalev、Alexey S. Kubasov、Pavel V. Strashnov、Zhanna V. Matsulevich、Julia M. Lukiyanova、Galina N. Borisova、Andreii S. Kritchenkov、Maria M. Grishina、Alexey A. Artemjev、Ivan V. Buslov、Vladimir K. Osmanov、Valentine G. Nenajdenko、Nguyen Q. Trung、Alexander V. Borisov、Alexander G. Tskhovrebov
DOI:10.1021/acs.cgd.1c00954
日期:2022.1.5
with unactivated nitriles, that represent a novel type of supramolecular building blocks which eagerly engage in a variety of chalcogen bonding interactions. The substituent-dependent propensity of novel selenadiazoles for the formation of four-center Se···N chalcogen bonding is analyzed. Other weak interactions, which in some cases outcompete the formation of 2Se–2N squares, are described. The discovery
Novel cationic 1,2,4-selenadiazoles: synthesis <i>via</i> addition of 2-pyridylselenyl halides to unactivated nitriles, structures and four-center Se⋯N contacts
作者:Victor N. Khrustalev、Maria M. Grishina、Zhanna V. Matsulevich、Julia M. Lukiyanova、Galina N. Borisova、Vladimir K. Osmanov、Alexander S. Novikov、Anatoly A. Kirichuk、Alexander V. Borisov、Euro Solari、Alexander G. Tskhovrebov
DOI:10.1039/d1dt01322j
日期:——
2-Pyridylselenyl halides undergo facile coupling with a triple CN bond of unactivatednitriles. Unprecedented heterocyclization allowed the preparation of a novel class of cationic 1,2,4-selenadiazoles in remarkably high yields. Cationic 1,2,4-selenadiazoles form supramolecular dimers in the crystal via Se⋯N chalcogen bonding, which was studied theoretically.
Novel Chalcogen Bond Donors Derived from [3+2] Cycloaddition Reaction between 2-Pyridylselenyl Reagents and Isocyanates: Synthesis, Structures and Theoretical Studies
作者:Alexey A. Artemjev、Alexey S. Kubasov、Vladimir P. Zaytsev、Alexander V. Borisov、Andreii S. Kritchenkov、Valentine G. Nenajdenko、Rosa M. Gomila、Antonio Frontera、Alexander G. Tskhovrebov
DOI:10.1021/acs.cgd.3c00101
日期:——
4-selenodiazolium salts in high yields. The mechanism was analyzed using DFT calculations, evidencing the concerted nature of the novel cycloadditionreaction. The new Se-containing heterocycles were demonstrated to be structurally easily tunable donors of the chalcogenbonding (ChB). Noncovalent interactions in the solid state were studied using DFT calculations, molecular electrostatic potential surfaces