Copper-Catalyzed Enantioselective Trifluoromethylthiolation of Secondary Propargyl Sulfonates

Although trifluoromethylthiolated compounds have privileged applications in pharmaceuticals and agrochemicals,efficient strategies for the asymmetric construction of C_(sp)^(3)-SCF_(3)bonds are limited.Specifically,the catalytic asymmetric nucleophilic trifluoromethylthiolation remains challenging.Here,we report a copper-catalyzed enantioselective nucleophilic trifluoromethylthiolation of secondary propargyl sulfonates with trifluoromethylthio silver.The reaction exhibits high efficiency,good enantioselectivity,high functional group tolerance,and broad substrate scope,paving a new way for the asymmetric synthesis of trifluoromethylthiolated compounds.

Preparation and Characterization of Polyaniline Nanofibers by Template-free Method

In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the formation probability, morphology, and diameter of the resulting PAni-TSA nanofibers were sensitive to the synthetic conditions, such as reaction temperature, the molar ratio of TSA to aniline, and the concentration of TSA in the polymerization media. The molecular structure was characterized by using the FT-IR, Raman spectra and X-ray diffraction, which shows that the main chain structure of PAni-TSA nanofibers was in agreement with that of granular PAni.

1,1-二取代-1,2-丙二烯化合物的合成

以炔烃为原料,经磺酸炔丙酯与格氏试剂的SN2’反应合成1,1-二取代-1,2-丙二烯型化合物.该方法具有原料简单易得、反应条件温和、副反应较少、产率高等优点.产物经1 H NMR、13 C NMR、IR以及MS确证.

丙炔[口恶]草酮的合成新方法

[目的]研究一种温和、安全性好的丙炔[口恶]草酮合成新方法。[方法]以无水碳酸盐为缚酸剂,在DMF溶剂中,5-特丁基-3-[2,4-二氯-5-羟基苯基]-1,3,4-[口恶]二唑-2(3H)-酮与对甲苯磺酸炔丙基酯反应合成丙炔[口恶]草酮,探究了实验条件对反应的影响。[结果]以对甲苯磺酸炔丙基酯替代燃爆性强的3-氯丙炔,在常压、无催化剂条件下合成丙炔[口恶]草酮,收率最高为97.1%,溶剂回收可循环使用。