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
Synthesis of diaryl selenides using electrophilic selenium species and nucleophilic boron reagents in ionic liquids
作者:Camilo S. Freitas、Angelita M. Barcellos、Vanessa G. Ricordi、Jesus M. Pena、Gelson Perin、Raquel G. Jacob、Eder J. Lenardão、Diego Alves
DOI:10.1039/c1gc15725f
日期:——
We described herein the use of imidazolium ionic liquids [bmim]PF6 and [bmim]BF4 in the selective, metal and catalyst-free synthesis of unsymmetrical diaryl selenides by electrophilic substitution in arylboron reagents with arylselenium halides (Cl and Br) at room temperature. This is a general substitution reaction and it was performed with arylboronic acids or potassium aryltrifluoroborates bearing
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.