Solvent-free bromination reactions with sodium bromide and oxone promoted by mechanical milling
作者:Guan-Wu Wang、Jie Gao
DOI:10.1039/c2gc16606b
日期:——
New solvent-free brominations of 1,3-dicarbonyl compounds, phenols, various alkenes including chalcones, azachalcones, 4-phenylbut-3-en-2-one, methyl cinnamate, styrene and 1,3-cyclohexadiene were efficiently achieved by employing sodium bromide and oxone under mechanical milling conditions. The brominated products were obtained in good to excellent yields.
Eight new gold(III) complexes (1–8) of 5-aryl-3-(pyridin-2-yl)-4,5-dihydropyrazole-1-carbothioamide have been synthesized and characterized by elemental analysis, molar conductivity, IR, UV, 1H NMR, 13C NMR, MS, and thermal analysis techniques. The cytotoxicity was tested by MTT assay. The results indicate that the complexes 1–8 exert cytotoxic effects against HeLa and A549 cell lines. Moreover, the
八个新金(III)络合物(1 - 8)的5-芳基-3-(吡啶-2-基)-4,5-二氢吡唑-1-硫代甲酰胺的已经合成和表征通过元素分析,摩尔电导率,IR, UV,1 H NMR,13 C NMR,MS和热分析技术。通过MTT测定法测试细胞毒性。结果表明,复合物1 – 8对HeLa和A549细胞株具有细胞毒作用。此外,复合物1,4,5,7和8与顺铂相比,对HeLa细胞系具有更高的细胞毒性。这表明苯上的取代基对细胞毒性具有重要影响。
Enantioselective synthesis of chiral α,β-unsaturated γ-substituted butyrolactams by organocatalyzed direct asymmetric vinylogous Michael addition of α,β-unsaturated γ-butyrolactam to 2-enoylpyridines
organocatalyzed direct asymmetric vinylogous Michaeladdition reaction of α,β-unsaturated γ-butyrolactam to 2-enoylpyridines has been developed with a chiral bifunctional amine-squaramide as the catalyst. This approach provides easy access to a series of optically active α,β-unsaturated γ-substituted butyrolactams in high yields (up to 99%) with excellent diastereoselectivities (up to >99 : 1) and enantioselectivities
Unexpected manganese(iii) acetate-mediated reactions of β-enamino carbonyl compounds with 1-(pyridin-2-yl)-enones under mechanical milling conditions
作者:Zi Liu、Guang-Peng Fan、Guan-Wu Wang
DOI:10.1039/c2cc36360g
日期:——
The solvent-free reactions of beta-enamino carbonylcompounds with 1-(pyridin-2-yl)-enones in the presence of manganese(iii) acetate dihydrate unexpectedly afforded 2-acyl-3-aryl-6,7-dihydro-4(5H)-benzofuran derivatives under mechanical milling conditions.
Asymmetric Diels-Alder reactions between aza-chalcone and cyclopentadiene (CP) catalyzed by the binaphthol-titanium (BINOL – Ti) in the presence of HMPA (80 mole %) were studied. The products were obtained with up to 87% ees.