90322-49-9Relevant articles and documents
Structurally-thrifty and visible-absorbing fluorophores
Chen, Yan,Li, Yanchun,Luo, Xiao,Qian, Xuhong,Sun, Zhenglong,Yang, Youjun,Zhu, Weihong
, (2020/09/16)
Fluorophores with a minimal push-pull backbone are actively pursued due to their potentials in biological labelling. Herein a series of structurally-thrifty and visible-absorbing fluorophores (SDXs) were successfully constructed following the D′D-π-A design strategy, in which a secondary donor (D′) was introduced in conjugation with the donor (D) to enhance its electron donating capability. For a very small scaffold, SDXs exhibit a surprisingly long-wavelength absorption band in the visible spectral range (λabs = 420 nm) and a strong green fluorescence emission (λem = 530 nm) with a fluorescence quantum yield up to 0.84. Notably, fluorescence of SDXs was quenched in hydrogen-bonding solvents, e.g. MeOH and H2O. This phenomenon renders SDXs feasibility for imaging of cellular non-hydrogen-bonding microenvironment, as demonstrated with BEAS-2B cells. These results proved that the D′D-π-A is a powerful design strategy to construct novel structurally-thrifty fluorophores.
Tricyclic [1,2,4]triazine 1,4-dioxides as hypoxia selective cytotoxins
Hay, Michael P.,Hicks, Kevin O.,Pchalek, Karin,Lee, Ho H.,Blaser, Adrian,Pruijn, Frederik B.,Anderson, Robert F.,Shinde, Sujata S.,Wilson, William R.,Denny, William A.
supporting information; experimental part, p. 6853 - 6865 (2009/12/03)
A series of novel tricyclic triazine-di-N-oxides (TTOs) related to tirapazamine have been designed and prepared. A wide range of structural arrangements with cycloalkyl, oxygen-, and nitrogen-containing saturated rings fused to the triazine core, coupled with various side chains linked to either hemisphere, resulted in TTO analogues that displayed hypoxia-selective cytotoxicity in vitro. Optimal rates of hypoxic metabolism and tissue diffusion coefficients were achieved with fused cycloalkyl rings in combination with both the 3-aminoalkyl or 3-alkyl substituents linked to weakly basic soluble amines. The selection was further refined using pharmacokinetic/pharmacodynamic model predictions of the in vivo hypoxic potency (AUCreq) and selectivity (HCD) with 12 TTO analogues predicted to be active in vivo, subject to the achievement of adequate plasma pharmacokinetics.