Synthesis of 3-(2-nitrovinyl)-4H-chromones: useful scaffolds for the construction of biologically relevant 3-(pyrazol-5-yl)chromones
作者:Raquel G. Soengas、Vera L.M. Silva、Daisuke Ide、Atsushi Kato、Susana M. Cardoso、Filipe A. Almeida Paz、Artur M.S. Silva
DOI:10.1016/j.tet.2016.04.042
日期:2016.6
N-methylhydrazones with the obtained nitroalkenes gave the corresponding pyrazoles. Among the prepared pyrazoles, derivative 6j, which contains a catechol moiety, showed simultaneously a potent 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavengingactivity and an α-glucosidaseinhibitoryactivities.
Enhydrazine, 6
<sup>1)</sup>
Weitere Enhydrazone, Tetrahydroindazolone und Enhydrazine aus cyclischen β‐Dicarbonylverbindungen
作者:Wolfgang Sucrow、Carl Mentzel、Marion Slopianka
DOI:10.1002/cber.19731060211
日期:1973.2
Aus Dimedon, 1,3-Cyclohexandion und 2-Methyl-1,3-cyclopentandion werden mit Benzaldehyd-alkylhydrazonen weitereEnhydrazone (4e, f, 5a–e, 17b–e) erhalten, die z. T. zu Enhydrazinen (19a, b, 20b, c) hydriert werden. Ferner wird die Darstellung weiterer Tetrahydroindazolone (6e, f, 7a–f, 9, 10, 13, 15) aus Dimedon und 1,3-Cyclohexandion beschrieben.
Mechanistic Studies on the Michael Addition of Amines and Hydrazines To Nitrostyrenes: Nitroalkane Elimination via a Retro-aza-Henry-Type Process
作者:Michael G. Kallitsakis、Peter D. Tancini、Mudit Dixit、Giannis Mpourmpakis、Ioannis N. Lykakis
DOI:10.1021/acs.joc.7b02637
日期:2018.2.2
In this article we report on the mechanistic studies of the Michaeladdition of amines and hydrazines to nitrostyrenes. Under the present conditions, the corresponding N-alkyl/aryl substituted benzyl imines and N-methyl/phenyl substituted benzyl hydrazones were observed via a retro-aza-Henry-type process. By combining organic synthesis and characterization experiments with computational chemistry calculations
A New Route to Substituted Pyrimido[5,4-e]-1,2,4-triazine-5,7(1H,6H)-diones and Facile Extension to 5,7(6H,8H) Isomers
作者:H. Showalter、Anjanette Turbiak
DOI:10.1055/s-0029-1217030
日期:2009.12
pyrimido[5,4-e]-1,2,4-triazine-5,7(1H,6H)-diones is outlined. The synthesis proceeds via pre-formed hydrazone intermediates, which are then condensed with an activated chlorouracil to build up the entire molecular framework, followed by a reductive ring closure to provide the parent series. The route has been extended to the isomeric pyrimido[5,4-e]-1,2,4-triazine-5,7(6H,8H)-dione class via the use of methylhydrazine