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The diastereomers 10-N-[2-fluoro-6-chloro-9H-9-purinyl]-(9R, 10R)-dihydroartemisinin(A) and10-N-[2-fluoro-6-chloro-9H-9-purinyl]-(9S, 10S)-dihydroartemisinin(B) were obtained via a trifluoroacetic acid catalyzed procedure simultaneously. Their structures were characterized by HRMS, MS, 1H-NMR, 13C-NMR, 2D NMR(COSY) and IR spectroscopy, and the configurations were further confirmed by X-Ray diffraction and Density functional theory (DFT). Then, the intermolecular interactions were studied mainly through Hershfield surface (HS), molecular electrostatic potential (MEP) and frontier molecular orbital (FMO) methods. Finally, preliminary anticancer evaluations of A and B were conducted in human breast tumor cell lines (MDA-MB-436, T47D) and a normal mammary epithelial cell line (MCF-10A). The GI50 of A and B were better or comparable to the positive drug mercaptopurine (6-MP), and both of novel compounds did not display significant cytotoxicity toward MCF-10A. [ABSTRACT FROM AUTHOR]

In this study, surface initiation was used to form dense and flat films in liquid crystal media. As a result, low-surface-energy components are thermodynamically forced to segregate on the liquid crystal-polymer interface already during the polymerization process. This finding is confirmed by ATR and XPS. In addition, more low-surface-energy components accumulate on the wall surface of the polymer upon decreasing the UV light intensity during polymerization. These components reduce both the anchoring energy of the polymer wall as well as the threshold voltage of any liquid crystal device that uses this polymer wall. [ABSTRACT FROM AUTHOR]