482628-00-2

Upstream product

• 56518-43-5 4-bromo-3,5-dimethoxybenzoyl chloride 
• 124-68-5 2-Amino-2-methyl-1-propanol 
• 56518-42-4 4-bromo-3,5-dimethoxybenzoic acid 

Downstream Products

• 482628-01-3 2-(4-methylthio-3,5-dimethoxyphenyl)-4,4-dimethyl-2-oxazoline 

Relevant academic research and scientific papers

Development of a Series of Near-Infrared Dark Quenchers Based on Si-rhodamines and Their Application to Fluorescent Probes

Near-infrared (NIR) fluorescent probes based on the F?rster resonance energy transfer (FRET) mechanism have various practical advantages, and their molecular design is generally based on the use of NIR dark quenchers, which are nonfluorescent dyes, as cleavable FRET acceptors. However, few NIR dark quenchers can quench fluorescence in the Cy7 region (over 780 nm). Here, we describe Si-rhodamine-based NIR dark quenchers (SiNQs), which show broad absorption covering this region. They are nonfluorescent independently of solvent polarity and pH, probably due to free rotation of the bond between the N atom and the xanthene moiety. SiNQs can easily be structurally modified to tune their water-solubility and absorption spectra, enabling flexible design of appropriate FRET pair for various NIR fluorescent dyes. To demonstrate the usefulness of SiNQs, we designed and synthesized a NIR fluorescent probe for matrix metalloproteinase (MMP) activity using SiNQ780. This probe 1 could detect MMP activity in vitro, in cultured cells and in a tumor-bearing mouse, in which the tumor was clearly visualized, by NIR fluorescence. We believe SiNQs will be useful for the development of a wide range of practical NIR fluorescent probes. (Chemical Equation Presented).

Bis(5-aryl-2-pyridyl) derivatives

A bis(5-aryl-2-pyridyl) compound represented by formula (1) or a salt thereof: wherein A is a substituted or unsubstituted aromatic hydrocarbon group or a substituted or unsubstituted aromatic heterocyclic group, and X is a group selected from the group consisting of moieties having formulas (2) to (5): wherein, in formula (2), m is an integer of 1 or 2; in formula (3), n is an integer of 1 to 6; and in formula (4), R is hydrogen or a lower alkyl group and p is an integer of 1 to 6.