Паладијум на угљенику у peg-400/циклохексану: каталитички систем kojи се може рециклирати и поново употребити за ефикасно декарбониловање алдехида

A simple methodology for the decarbonylation of aldehydes catalysed by commercially available palladium on carbon in a green two-solvent system is reported. Various aromatic, aliphatic and heteroaromatic aldehydes were transformed to the corresponding decarbonylated products in good yields. Product isolation from the reaction mixture is simple in practice, and the catalyst can be reused three times.Развијена је једноставна метода за декарбониловање алдехида користећи комерцијално доступни паладијум на угљенику уз употребу зелених растварача. Различити ароматични, алифатични и хетероароматични алдехиди могу се трансформисати у декарбониловане производе у добром приносу и без настајања споредних производа. Производи се једноставно изолоју из реакционе смеше, а исти катализатор се може употребити још три пута без значајног смањења приноса

Decarbonylative bromination and decarbonylation of aromatic and heteroaromatic aldehydes

Sintetisan je i okarakterisan katalizator magnetnih osobina na bazi paladijuma (Pd/Fe2O3) kao i katalizator na bazi paladijuma gde je kao nosač upotrebljena bakterijska nanoceluloza (Pd/BNC) i ispitana je njihova primena u reakciji dekarbonilovanja aldehida. Optimizovani reakcioni uslovi primenjeni su na aromatičnim i heteroaromatičnim aldehidima i na alifatičnim aldehidima koji imaju vodonikove atome na α- i δ-ugljenikovim atomima. Istovremeno, određen je mehanizam reakcije dekarbonilovanja i ispitana je mogućnost reciklovanja katalizatora. Pored reakcije dekarbonilovanja sintetisani katalizator Pd/Fe2O3 upotrebljen je i u reakciji reduktivnog dehalogenovanja arilhalogenida. U nastavku istražena je i reakcije dekarbonilativnog bromovanja 5-ariltiofen-2-karbaldehida. Eksperimentalnim i računarskim metodama ispitan je mehanizam reakcije kao i njena primena u sintezi triarilsupstituisanih tiofena.Palladium-based catalysts obtained by palladium immobilization on maghemite (Pd/ γ-Fe2O3) and bacterial nanocellulose (Pd/BNC) as solid supports were synthesized and characterized and their application in the decarbonylation reaction was investigated. Optimized reaction conditions were applied to a series of aromatic and heteroaromatic aldehydes as well as to several aldehydes having alpha and beta hydrogen atoms. The mechanism of the mentioned transformation as well as the possibility of catalyst recycling has also been investigated. In addition to the decarbonylation reaction, the synthesized catalyst Pd/γ-Fe2O3 was used in the reductive dehalogenation reaction of arylhalides. The decarbonylative bromination reaction of 5-arylthiophene-2-carbaldehydes was also investigated. By combining experimental and computational methods, the mechanism of this reaction was examined, as well as its application to the synthesis of triaryl-substituted thiophene derivatives

Supplementary data for article: Nikolić, A. M.; Ajdačić, V.; Opsenica, I. M. Palladium-Catalyzed N-Arylation of 1-Substituted-1H-Tetrazol-5-Amines. Journal of Organometallic Chemistry 2019, 880, 134–142. https://doi.org/10.1016/j.jorganchem.2018.11.007

Supplementary material for: [https://doi.org/10.1016/j.jorganchem.2018.11.007]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/3787

Supplementary material for the article: Ajdačić, V.; Stepanović, S.; Zlatović, M.; Gruden, M.; Opsenica, I. M. Decarbonylative Dibromination of 5-Phenylthiophene-2-Carbaldehyde with Bromine. Synthesis (Germany) 2016, 48 (24), 4423–4430. https://doi.org/10.1055/s-0035-1562615

Supplementary material for: [http://dx.doi.org/10.1055/s-0035-1562615]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2361

Supplementary material for the article: Ajdačić, V.; Nikolić, A.; Kerner, M.; Wipf, P.; Opsenica, I. M. Reevaluation of the Palladium/Carbon-Catalyzed Decarbonylation of Aliphatic Aldehydes. Synlett 2018, 29 (13), 1781–1785. https://doi.org/10.1055/s-0037-1610433

Supplementary material for: [https://doi.org/10.1055/s-0037-1610433]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2192

Antibacterial and antifungal properties of guanylhydrazones

A series of novel guanylhydrazones were designed, synthesized and characterized. All the compounds were screened for their antibacterial and antifungal activity. Compounds 26 and 27 showed excellent antibacterial activities against Staphylococcus aureus ATCC 25923 and Micrococcus luteus ATCC 379 with minimal inhibitory concentrations of 4 ae g mL(-1), and good antifungal activity against Candida parapsilosis ATCC 22019. These results suggested that the selected guanylhydrazones could serve as promising leads for improved antimicrobial development

Supplementary material for the article: Ajdačić, V.; Nikolić, A.; Kerner, M.; Wipf, P.; Opsenica, I. M. Reevaluation of the Palladium/Carbon-Catalyzed Decarbonylation of Aliphatic Aldehydes. Synlett 2018, 29 (13), 1781–1785. https://doi.org/10.1055/s-0037-1610433

Supplementary material for: [https://doi.org/10.1055/s-0037-1610433]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2192

Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of N,1-Diaryl-1H-tetrazol-5-amines

The Pd-catalyzed N-arylation method for the synthesis of eighteen N,1-diaryl-1H-tetrazol-5-amine derivatives is reported. By running the reactions at 35 °C, compounds were isolated as single isomers since the undesired Dimroth rearrangement was completely suppressed. Furthermore, the Dimroth rearrangement of N,1-diaryl-1H-tetrazol-5-amines was rationalized by conducting comprehensive experiments and NMR analysis as well as density functional theory (DFT) calculations of thermodynamic stability of the compounds. It was established that the Dimroth rearrangement is thermodynamically controlled, and the equilibrium of the reaction is determined by the stability of the corresponding isomers. The mechanism was investigated by additional DFT calculations, and the opening of the tetrazole ring was shown to be the rate-determining step. By maneuvering Pd-catalyzed N-arylation and the subsequent Dimroth rearrangement, two more N,1-diaryl-1H-tetrazol-5-amine derivatives were acquired, which otherwise cannot be synthesized by employing the C–N cross-coupling reaction.This is the peer-reviewed, authors’ version of the article: Nikolić, A., Stanić, J., Zlatar, M., Gruden, M., Anđelković, B., Selaković, Ž., Ajdačić, V.,& Opsenica, I. (2021). Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of N,1-Diaryl-1H-tetrazol-5-amines. The Journal of Organic Chemistry, American Chemical Society (ACS)., 86(6), 4794-4803. [https://doi.org/10.1021/acs.joc.1c00282]This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Organic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [https://doi.org/10.1021/acs.joc.1c00282]The published version: [https://cherry.chem.bg.ac.rs/handle/123456789/4358]The supporting information: [https://cherry.chem.bg.ac.rs/handle/123456789/4360

Supporting information for the article: Nikolić, A., Stanić, J., Zlatar, M., Gruden, M., Anđelković, B., Selaković, Ž., Ajdačić, V.,& Opsenica, I. (2021). Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of N,1-Diaryl-1H-tetrazol-5-amines. The Journal of Organic Chemistry, American Chemical Society (ACS)., 86(6), 4794-4803. https://doi.org/10.1021/acs.joc.1c00282

Copies of 1H and 13C NMR spectra for the synthesized compounds; Extended computational results, and total electronic energies, number of imaginary frequencies; Cartesian coordinates of all structures.This is the supporting information for the article: Nikolić, A., Stanić, J., Zlatar, M., Gruden, M., Anđelković, B., Selaković, Ž., Ajdačić, V.,& Opsenica, I. (2021). Controlling Pd-Catalyzed N-Arylation and Dimroth Rearrangement in the Synthesis of N,1-Diaryl-1H-tetrazol-5-amines. The Journal of Organic Chemistry, American Chemical Society (ACS)., 86(6), 4794-4803. [https://doi.org/10.1021/acs.joc.1c00282]The published version: [https://cherry.chem.bg.ac.rs/handle/123456789/4358]The peer-reviewed version: [https://cherry.chem.bg.ac.rs/handle/123456789/4359

Supplementary material for the article: Lazić, J.; Ajdačić, V.; Vojnovic, S.; Zlatović, M.; Pekmezovic, M.; Mogavero, S.; Opsenica, I.; Nikodinovic-Runic, J. Bis-Guanylhydrazones as Efficient Anti-Candida Compounds through DNA Interaction. Appl Microbiol Biotechnol 2018, 102 (4), 1889–1901. https://doi.org/10.1007/s00253-018-8749-3

Supplementary material for: [https://doi.org/10.1007/s00253-018-8749-3]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/2078