The visible light-driven C2 or C3 amination of indoles without any additives was initiated via electron donor-acceptor (EDA) complex formed by indole and N-aminopyridinium salt. This method was compatible with a wide range of substrates and could proceed smoothly without the addition of any photocatalysts, transition-metal catalysts, or bases. A variety of studies were carried out to examine the presence of EDA complex.
It was demonstrated that this method was safe and easy. No side-effect was observed after the implantation of I(125) seeds. The brachytherapy was proven to be a potential method for patients who were at high risk to recrudesce the malignant osteosarcoma of tumors after the tumor excision.
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