Rajappa, Srinivasachari; Sreenivasan, Ramaswami, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1987, vol. 26, # 1-12, p. 107 - 109
Synthesis of Isoxazoline Derivatives Based on Nitrile Oxide Cycloaddition of Nitroso-Nitro-Enamine
作者:László András Kondacs、Mihály Viktor Pilipecz、Zoltán Mucsi、Barbara Balázs、Tamás Gáti、Miklós Nyerges、András Dancsó、Péter Nemes
DOI:10.1002/ejoc.201500905
日期:2015.11
A new and stable nitroso-nitro-enamine reagent, providing a nitrile oxide 1,3-dipole, has been treated with dipolarophiles in the course of 1,3-dipolar cycloaddition reactions to give a large number of novel isoxazolyl-pyrroline derivatives. Surprisingly, instead of the expected 2-isoxazolyl-dihydropyrrole cycloadducts, dihydropyrrol-3-one oximes were isolated as the main products in most cases. The
Simple route to new oxadiazaboroles and oxadiazoles via amidoximes
作者:Mihály V. Pilipecz、Tamás R. Varga、Péter Králl、Zoltán Vincze、Zoltán Mucsi、Ruth Deme、Pál T. Szabó、Péter Nemes
DOI:10.1080/00397911.2020.1755439
日期:2020.6.2
Abstract The novel push–pull alkene, the 2-(nitro-nitrosomethylene)-pyrrolidine with numerous aliphatic or aromatic amines as nucleophiles afforded amidoximes. Various substituted oxadiazaborole and oxadiazole derivatives were prepared starting from these amidoximes, widening the synthetic applicability of the push–pull alkenes. Acylation of the amidoximes was also examined. The mechanism of the amidoxime
Synthesis of 2-aryl-1,2,4-triazol-3-one derivatives from β-nitroenamines
作者:Dániel Nagy、Mihály V. Pilipecz、László A. Kiss、Anna Alekszi-Kaszás、András Simon、Gitta Z. Schlosser、Péter Nemes、Tamás R. Varga
DOI:10.1080/00397911.2021.1913504
日期:——
4-triazol-3-ones from cyclic β-nitroenamines in four steps is provided, with an overall yield of 8–70%. The nitrazone to amidrazone conversion (third step) could not proceed in absence of LiBr catalyst, and the crucial role of this mild Lewis acid is emphasized. The last cyclization step required the boosting effect of N-methylimidazole and elevated reaction temperature, as well. This reliable synthesis is highly
compounds starting from activated enamines, i.e., 2-nitromethylene-pyrrolidine and pyrrolidin-2-ylidene-acetic acid ethyl ester, with various amines and formaldehyde or ethyl glyoxylate are described. In order to furnish new Mannich type molecules and to improve the yields sequential reaction routes and 1,2,3-benzotriazole-substituted adducts as reactants were also tested. Additionally, the steric structure
Reductive transformations of unsaturated azabicyclic nitrolactams
作者:Mihály Viktor Pilipecz、Tamás Róbert Varga、Pál Scheiber、Zoltán Mucsi、Amélie Fàvre-Mourgues、Sándor Boros、László Balázs、Gábor Tóth、Péter Nemes
DOI:10.1016/j.tet.2012.04.100
日期:2012.7
different reducing methods unsaturated indolizidine and quinolizidine lactams substituted with a nitrogroup were transformed into various alkaloid-like derivatives. Hydrogen transfer and palladium catalyzed hydrogenation gave compounds of ketolactam or lactam type meanwhile the nitrogroup was eliminated. On the other hand, in presence of Raney-nickel catalyst the nitro compounds were reduced to diastereomeric