57270-81-2Relevant articles and documents
Merocyanine-type dyes from barbituric acid derivatives
Rezende, Marcos Caroli,Campodonico, Paola,Abuin, Elsa,Kossanyi, Jean
, p. 1183 - 1190 (2001)
The preparation and the solvatochromic behavior of two dyes, obtained by condensation of N,N′-dimethylbarbituric acid with dimethylaminobenzaldehyde and with 4,4′-bis(N,N-dimethylamino)benzophenone (Michler's ketone) are described. The latter dye is rathe
Barbituric acid based fluorogens: Synthesis, aggregation-induced emission, and protein fibril detection
Ding, Siyang,Yao, Bicheng,Schobben, Louis,Hong, Yuning
, (2020/01/11)
Fluorescent dyes, especially those emitting in the long wavelength region, are excellent candidates in the area of bioassay and bioimaging. In this work, we report a series of simple organic fluorescent dyes consisting of electron-donating aniline groups and electron-withdrawing barbituric acid groups. These dyes are very easy to construct while emitting strongly in the red region in their solid state. The photophysical properties of these dyes, such as solvatochromism and aggregation-induced emission, are systematically characterized. Afterward, the structure-property relationships of these barbituric acid based fluorogens are discussed. Finally, we demonstrate their potential applications for protein amyloid fibril detection.
Dynamic Covalent Metathesis in the C=C/C=N Exchange between Knoevenagel Compounds and Imines
Gu, Ruirui,Flidrova, Karolina,Lehn, Jean-Marie
, p. 5560 - 5568 (2018/05/01)
Fast and reversible dynamic covalent C=C/C=N exchange takes place without catalyst in nonpolar solvents between barbiturate-derived Knoevenagel (Kn) compounds and imines. A detailed study of the reaction indicates that it proceeds by an associative organo-metathesis mechanism involving the formation of a four-membered ring azetidine intermediate by addition of the imine C=N group to the C=C bond of the Kn compound. This intermediate could be generated cleanly and stabilized at low temperature by condensation of the o,p-dinitrophenyl Kn derivative with the cyclic imine 1-azacyclohexene. It was characterized by extensive NMR and mass spectrometric studies. The process described represents a genuine dynamic covalent organo-metathesis through a four-membered ring adduct as intermediate. It paves the way for the exploration of a wide set of dynamic systems involving (strongly) polarized C=C bonds and various imines, extending also into covalent dynamic polymers and polymolecular assemblies.