1,2,3-Triazole linked carbohydrate and podophyllotoxin were synthesized in high yield and selectivity. The CuI-catalyzed Huisgen’s [2+3] cycloaddition of azides and alkynes was proved to be powerful tool for constructing podophyllotoxin derivatives.
The SiO2/NaGdF4:Eu3+ core/shell composite was prepared by a template-mediated method, making monodispersed SiO2 as core and NaGdF4:Eu colloids as shell, the morphology and the core-shell structure of the resulting particles were analyzed by SEM,X-ray diffraction, and the photo-luminescence and magnetic properties of the microspheres were investigated too. The results shows the composite have great potential to be used as homogeneous magnetic/optical bifunctional material.
A general synthesis of nucleoside 5'-phosphoromorpholidates from carboxybenzyl-protected nucleosides has been developed. Phosphitylation, acid-catalyzed hydrolysis, and oxidative coupling generated the phosphomorpholidate products in high yields.
A new unsymmetrical photochromic diarylethene 1o, which is named 1-(2- methoxyphenyl)-2-[2-methyl-5-(1,3-dioxolane)-3-thienyl]perfluorocyclopentene, was synthesized. Its photochromic and simulated molecule structure were also investigated in detail. This diarylethene underwent reversible photochromism, changing between colorless and blue in hexane solution upon appropriate irradiation with UV/vis light. The kinetic experiments illustrated that the cyclization/cycloreversion process of this compound was determined to be the zeroth/first reaction. In addition, this compound can be used as optical recording materials.
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