One-pot reactions of nitroenamines with anilines and ethyl glyoxylate
作者:Mihály V. Pilipecz、Pál Scheiber、Zoltán Vincze、Tamás R. Varga、Gábor Tóth、Péter Nemes
DOI:10.1016/j.tet.2014.04.096
日期:2014.7
In a simple, one-pot, catalyst-free procedure starting from heterocyclic nitroenamines, substituted anilines and ethyl glyoxylate new ethyl 2-arylamino-3-nitro-propionates were prepared in good to excellent yields. Depending on the substituent pattern of the anilines applied, two routes for the one-pot reaction are suggested. Additionally, it was demonstrated that these multifunctional compounds of
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
Rajappa, Srinivasachari; Sreenivasan, Ramaswami, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1987, vol. 26, # 1-12, p. 107 - 109