Methods and compositions related to modified fluorophores

Abstract

The present invention provides a novel one-step synthesis method for producing cyanine-based fluorophores with modified polymethine chains to prevent aggregation, enhancing their utility in biomedical research. These fluorophores, such as unsymmetrical heptamethine cyanines like SAT-IR-746, exhibit improved sensitivity, photostability, and brightness, making them ideal for applications such as live-cell imaging, biomolecule labeling, and near-infrared fluorescence microscopy. The synthesis process involves the preparation of a pyridinium benzoxazole (PyBox) intermediate from a substituted pyridine derivative and 2-chlorobenzoxazole, followed by condensation with sulfonated and substituted indolenines to form asymmetrical cyanine dyes, achieving high yields (e.g., 55-82% for SAT-IR series compounds). By addressing the aggregation issue common in traditional cyanine dyes through β-position substitution on the polymethine chain, this invention enables more accurate and reliable labeling and tracking of biomolecules without quenching, facilitating advanced imaging techniques and deeper insights into biological processes.

Dependencies are inferred from the claim text.