Disclosed is a small molecule dye for use in imaging in the near-infrared window, namely between 1000 nm-1700 nm wavelength. The present dyes are also useful for photoacoustic imaging and photothermal therapy. The dyes have a structure of a D-A-D (donor-acceptor-donor) fluorescent compound core and side chains rendering the compounds water soluble and easily conjugated to hydrophilic polymers and/or targeting ligands. Further disclosed is compound, CH1055 that can be PEGylated, conjugated to a targeting ligand, or conjugated to taurine. Key steps utilized to assemble the core structure of the target included a cross-Suzuki coupling reaction, iron reduction and N-thionylaniline induced ring closure. Four carboxylic acid groups were introduced into the donor-acceptor-donor (D-A-D) type fluorescent compound to impart a certain aqueous solubility and to allow facile conjugation to targeting ligands.
本文披露了一种用于近红外窗口成像的小分子
染料,即在1000纳米至1700纳米波长范围内。这些
染料还可用于光声成像和光热疗法。这些
染料具有D-A-D(给体-受体-给体)荧光化合物核心和侧链的结构,使化合物具有
水溶性,并可轻松与亲
水性聚合物和/或靶向
配体结合。此外,还披露了一种化合物CH1055,可以进行P
EG化,与靶向
配体结合,或与
牛磺酸结合。用于组装目标核心结构的关键步骤包括交叉Suzuki偶联反应、
铁还原和N-
硫代
苯胺诱导的环闭合。在给体-受体-给体(D-A-D)类型荧光化合物中引入了四个羧基,以赋予一定的
水溶性,并允许与靶向
配体轻松结合。