Synthesis and characterization of some pyridinium N-phenoxide betaine dyes for second-harmonic generation
摘要:
The synthesis and characterization of some pyridinium-N-phenoxide betaine dyes (including Reichardt's dye) for second-harmonic generation (SHG) is described. These dyes are highly solvatochromic, which indicates that they can have large second-order molecular polarizabilities. The effects of substituents on the solvatochromic and optical properties of the betaines are investigated. Also the crystal structure of the betaines is discussed and the molecular geometry in the crystal is compared to that predicted by AM1 calculations. The crystallographic space group of the betaines is found to be centrosymmetric; therefore these dyes are incapable of SHG as crystals. To overcome this obstacle, we have synthesized and characterized a chiral betaine; because of its chirality this compounds must necessarily crystallize in a noncentrosymmetric space group, thereby making it capable of SHG as a crystal. Lastly, the utility of these betaines for SHG in poled polymer films is discussed.
Mechanistic studies of fluorescent sensors for the detection of reactive oxygen species
作者:Belinda Heyne、Sara Ahmed、J. C. Scaiano
DOI:10.1039/b713575k
日期:——
Two new sensors for the detection of reactive oxygen species have been synthesized and characterized; they contain the 4-amino-7-nitrobenzofurazan (ABF) moiety covalently tethered to a phenol. Comparison of sensors ABFhd and dABFhd (the latter containing two ortho-methyl groups) shows that introduction of steric bulk leads to an improvement of fluorescent sensor performance, thus confirming our previous predictions based on computational chemistry. ABFhd and dABFhd are new tools for biological applications involving reactive oxygen species, in particular oxygen-centered radicals.
The aromatic amines (I), alkyl amines (II), bicyclic amines (III). ##STR1## cycloalkyl amines (IV), aromatic bicyclic amines (V), hydroquinone amines (VI), quinone amines (VII), amino-ethers (VIII) and bicyclic amino ethers (IX) are useful as pharmaceutical agents for treating a number of conditions including spinal trauma, mild and/or moderate to severe head injury, etc. Also disclosed is a method of treatment using the 3,4-dihydrobenzopyrans (XI).
Identification of RIPK3 Type II Inhibitors Using High-Throughput Mechanistic Studies in Hit Triage
作者:Amy C. Hart、Lynn Abell、Junqing Guo、Michael E. Mertzman、Ramesh Padmanabha、John E. Macor、Charu Chaudhry、Hao Lu、Kevin O’Malley、Patrick J. Shaw、Carolyn Weigelt、Matthew Pokross、Kevin Kish、Kyoung S. Kim、Lyndon Cornelius、Andrew E. Douglas、Deepa Calambur、Ping Zhang、Brian Carpenter、William J. Pitts
DOI:10.1021/acsmedchemlett.9b00065
日期:2020.3.12
Necroptosis has been implicated in a variety of disease states, and RIPK3 is one of the kinases identified to play a critical role in this signaling pathway. In an effort to identify RIPK3 kinase inhibitors with a novel profile, mechanistic studies were incorporated at the hit triage stage. Utilization of these assays enabled identification of a Type II DFG-out inhibitor for RIPK3, which was confirmed by protein crystallography. Structure-based drug design on the inhibitors targeting this previously unreported conformation enabled an enhancement in selectivity against key off-target kinases.
Benincori, T.; Sannicolo, F., Journal of Heterocyclic Chemistry, 1988, vol. 25, p. 1029 - 1033
作者:Benincori, T.、Sannicolo, F.
DOI:——
日期:——
PALEY, M. STEVEN;HARRIS, J. MILTON, J. ORG. CHEM., 56,(1991) N, C. 568-574