Unveiling [3 + 2] Cycloaddition Reactions of N-Methyl-C-3-Bromophenyl-Nitrone to Dimethyl Maleate: Molecular Electron Density Theory Perspective
نویسندگان
چکیده
Abstract. The zwitterionic-type (zw-type) [3+2] cycloaddition (32CA) reactions of N-methyl-C-3-bromophenyl-nitrone 1 with dimethyl maleate 2 increased electrophilicity were investigated using the Molecular Electron Density Theory (MEDT) at MPWB95/6-311++G(d,p) computational level. Both reactivity and selectivity are rationalized in relation to polarity reaction. associated zw-type 32CA accelerated due high nucleophilic character strong electrophilic 2, which also play a critical part mechanism reaction, influencing stereoselectivity, activation enthalpies between 34.04 38.37 kJ.mol-1 gas phase. CDFT indices used anticipate global electron density flux from 2. These exergonic have negative Gibbs free energy along endo exo stereochemical pathways. process is preferred over pathway this kinetically controlled predictions bonding evolution theory (BET) for pathways indicate one-step early transition states, compatible ELF topological examination states. Resumen. Las reacciones de cicloadición tipo zwitteriónico (tipo zw) N-metil-C-3-bromofenil-nitrona con maleato dimetilo aumento la electrofilicidad se investigaron utilizando Teoría Densidad Electrónica (MEDT, por sus siglas en inglés) el nivel teoría MPWB95/6-311++G(d,p). Tanto reactividad como selectividad racionalizan relación polaridad reacción. asociadas zw aceleran debido al alto carácter nucleofílico y fuerte electrofílico del que también juega un papel crítico mecanismo reacción, influyendo estereoselectividad, entalpías activación entre kJ.mol-1, fase gaseosa. Los índices Funcionales Conceptual (CDFT, utilizan para anticipar flujo densidad electrones desde nucleófilo hasta Estas exergónicas tienen energías libres negativa lo largo las vías estereoquímicas exo. El proceso estereoquímico es preferido sobre vía estereoquímica esta reacción controlada cinéticamente. predicciones evolución enlaces (BET, indican paso estados transición temprana, examen topológico Función Localización (ELF, los transición.
منابع مشابه
A Molecular Electron Density Theory Study of the Reactivity of Azomethine Imine in [3+2] Cycloaddition Reactions.
The electronic structure and the participation of the simplest azomethine imine (AI) in [3+2] cycloaddition (32CA) reactions have been analysed within the Molecular Electron Density Theory (MEDT) using Density Functional Theory (DFT) calculations at the MPWB1K/6-311G(d) level. Topological analysis of the electron localisation function reveals that AI has a pseudoradical structure, while the con...
متن کاملA molecular electron density theory study of the [3 + 2] cycloaddition reaction of nitrones with ketenes.
The [3 + 2] cycloaddition (32CA) reaction between nitrones and ketenes has been studied within the Molecular Electron Density Theory (MEDT) at the Density Functional Theory (DFT) MPWB1K/6-311G(d,p) computational level. Analysis of the conceptual DFT reactivity indices allows the explanation of the reactivity, and the chemo- and regioselectivity experimentally observed. The particular mechanism ...
متن کاملCycloaddition of methyl 2-(2,6-dichorophenyl)-2H-azirine- 3-carboxylate to electron rich 2-azadienes
متن کامل
Synthesis, Reactions and Antioxidant Activity of 5-(3', 4'-dihydroxy-tetrahydrofuran-2'-yl)-2-methyl-3-carbohydrazide
In this manuscript, we describe the synthesis of the carbohydrazide 2. Acid-catalyzed condensation with several carbonyl compounds to afford the corresponding carbohydrazide derivatives 3-12. Their acetylation afforded the corresponding acetyl derivatives 13-22. Oxidative cyclization of O-acetyl derivatives 19-22 afforded the corresponding 1,3,4-oxadiazole derivatives 23-2...
متن کاملSYNTHESIS AND PHARMACOLOGICAL EVALUATION OF 6-CARBETHOXY-5-(3'-BROMOPHENYL)-3-ARYL-2-CYCLOHEXENONES AND 6-ARYL-4-(3'-BROMOPHENYL)-3-OXO-2,3A,4,5-TETRAHYDRO-2H-INDAZOLES
6-Carbethoxy-5-(3'-bromophenyl)-3-aryl-2-cyclohexenones 2a-j were obtained from the1-Aryl-3-(3'-bromophenyl)-2-propene-1-ones 1a-j by Micheal addition of ethyl acetoacetate, followed by internal Claisen condensation. Reaction of 2a-j with hydrazine hydrate afforded the corresponding 6-Aryl-4-(3'-bromophenyl)-3-oxo-2,3a,4,5-tetrahydro-2H-indazoles 3a-j. The structures of newly synthesized compou...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Mexican chemical society
سال: 2022
ISSN: ['1870-249X', '1665-9686']
DOI: https://doi.org/10.29356/jmcs.v66i4.1801