Preparation and UV/Vis Spectroscopic Characterization of N,N-Disubstituted 2-Amino-5-arylazoselenazoles and Some of Their Carbocyclic and Heterocyclic Analogues
摘要:
By coupling of aryldiazonium salts 5 with N,N-disubstituted 2-amino-5H-selenazoles 4 deeply coloured 5-arylazo-substituted 2-amino-selenazoles 6a-6l have been prepared and their solvatochromic properties deter-mined by means of UV/Vis spectroscopy, and compared with the ones of several other arylazosubstituted N,N'-dialkylanilines 7a-7d, 2-(N,N-dialkylamino)-thiophenes 8a-8e, and 2-(N,N-dialkylamino)-thiazoles 9a-9c.
We investigated the superoxide anion scavenging effects of thirteen 2-amino-1,3-selenazoles using a highly sensitive quantitative chemiluminescence method. At 166 μM, the 2-amino-1,3-selenazoles scavenged in the range of 14.3 to 96.7% of O2−. 2-Piperidino-1,3-selenazole and 4-phenyl-2-piperidino-1,3-selenazole exhibited the strongest superoxide anion-scavenging activity among the 2-amino-1,3-selenazoles. The 50% inhibitory concentrations (IC50) of 2-piperidino-1,3-selenazole and 4-phenyl-2-piperidino-1,3-selenazole were determined to be 4.03 μM and 92.6 μM, respectively. Thus, these compounds acted in vitro as effective O2− scavengers.