A NIR BODIPY dye bearing 3,4,4a-trihydroxanthene moieties

Area of Science:

• Organic synthesis
• Photochemistry
• Biomedical imaging

Background:

• Development of novel fluorescent probes is crucial for advanced biological imaging.
• Near-infrared (NIR) dyes offer advantages for deep-tissue penetration and reduced autofluorescence.
• BODIPY dyes are a versatile class of fluorophores with tunable optical properties.

Purpose of the Study:

• To synthesize a novel xanthene-fused pyrrole derivative.
• To utilize the synthesized pyrrole for the preparation of a new NIR BODIPY dye.
• To evaluate the properties and applicability of the new BODIPY dye for live-cell imaging.

Main Methods:

• Synthesis of 3,4,4a-trihydroxanthene-fused pyrrole 2 via reaction of 2,3,4,4a-tetrahydro-1H-xanthen-1-one with 3-phenyl-2H-azirine using LDA.
• Preparation of NIR BODIPY 1 from pyrrole 2.
• Characterization of optical properties (absorption and emission spectra).
• Assessment of dye stability and cytotoxicity.
• Evaluation of labeling capabilities in living cells for NIR imaging.

Main Results:

• A novel 3,4,4a-trihydroxanthene-fused pyrrole (2) was successfully synthesized.
• A new NIR BODIPY dye (1) with absorption at 732 nm and emission at 747 nm was prepared using pyrrole 2.
• The synthesized BODIPY dye 1 demonstrated good stability and was non-cytotoxic.
• The dye proved effective for labeling living cells for imaging applications in the NIR region.

Conclusions:

• The novel pyrrole serves as a valuable precursor for NIR BODIPY synthesis.
• The developed NIR BODIPY dye exhibits favorable characteristics for biological applications.
• This new dye holds promise for advanced live-cell imaging techniques in the near-infrared spectrum.