Photophysics, photochemistry and photobiology of hypocrellin photosensitizers

Hypocrellins are novel photosensitizers from China, which are demonstrated to have significant anti- tumor and anti-virus activity and to be potential photo- dynamic therapy (PDT) agents. As compared with hemato- porphyrin, the only approved photosensitizer, hypocrellins have several advantages, such as easy preparation and easy purification, high triplet quantum yield, high singlet-oxygen quantum yield, high phototoxicity but low dark toxicity, and rapid clearance from normal issues. This article reviews briefly the photophysics, photochemistry and photobiology of hypocrellins on the basis of the domestic and international research results.     

分子内光环合反应在有机合成中应用的研究进展

分子内光环合反应是合成具有生物活性和医用价值杂环化合物的有效方法。该方法合成简便,在一些杂环化合物的合成中比传统方法更具有优势。分子内光环合反应的应用范围很广,利用该反应不但可以合成含有氮、氧和硫原子的杂环,而且可以构建不同大小的分子骨架。本文则按照可成环的大小,综述了分子内光环合反应在合成三元环、四元环、五六元环和大环等环状化合物中的运用。