Novel 2-pyrazoline derivatives as potential anticonvulsant agents
摘要:
A series of new 2-pyrazoline derivatives has been synthesized by reacting 3-(substituted-phenyl)-1-pyridin-2-yl-propenones using two routes one using thiosemicarbazide and the other by hydrazine hydrate. The chemical structures were established by IR, Mass, H-1-NMR, C-13-NMR spectroscopic data, and elemental analysis. The anticonvulsant activity of the synthesized compounds was evaluated by the "maximal electroshock seizure" (MES) test and pentylenetetrazole (PTZ) test using male albino mice. Compounds 2e, 5-(naphthalene-1-yl)-3-(pyridine-2-yl)-4,5-dihydro-1H-pyrazole-1-carbothioic acid amide, and 3c, N-ethyl-5-(naphthalene-1-yl)-3-(pyridine-2-yl)-4,5-dihydro-1H-pyrazole-1-carbothioamide showed appreciable activity in the MES as well as PTZ test at all the evaluated doses.
一种新型可重复使用的纳米磁性催化剂 Fe 2 O 3 @SiO 2 /In 2 O 3是通过简单的化学方法分三个连续步骤合成的。通过 FT-IR、XRD、SEM、EDX、TEM 和 VSM 对纳米催化剂进行了表征。XRD 图显示 Fe 2 O 3和 SiO 2的特征峰,伴随着分配给 In 2 O 3不同平面的新峰,证实了 In 2 O 3在 Fe 2 O 3 @SiO 2表面上的形成芯/壳纺锤体。TEM照片显示Fe 2 O 3的纺锤状颗粒被SiO 2壳覆盖,平均直径为20nm的In 2 O 3纳米颗粒悬浮在Fe 2 O 3 @SiO 2表面。纳米磁性催化剂 Fe 2 O 3 @SiO 2 /In 2 O 3用于将 (4-nitrophenyl)-1-phenyl-1H-pyrazole-5-amine 和查耳酮衍生物转化为有价值的偶氮甲碱化合物 3 -(取代)-1-(吡啶-2-基)烯丙基)-3-(4-硝基苯基)-1-苯基-1H
PCN Pincer Palladium(II) Complex Catalyzed Enantioselective Hydrophosphination of Enones: Synthesis of Pyridine-Functionalized Chiral Phosphine Oxides as NC<sub>sp<sup>3</sup></sub>O Pincer Preligands
作者:Xin-Qi Hao、Juan-Juan Huang、Tao Wang、Jing Lv、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/jo5015307
日期:2014.10.17
A series of chiral PCN pincer Pd(II) complexes VI–XIII with aryl-based aminophosphine–imidazoline or phosphinite–imidazoline ligands were synthesized and characterized. They were examined as enantioselective catalysts for the hydrophosphination of enones. Among them, complex IX, which features a Ph2PO donor as well as an imidazoline donor with (4S)-phenyl and N-Tol-p groups, was found to be the optimal
Highly enantioselective synthesis of naphthoquinones and pyranonaphthoquinones catalyzed by bifunctional chiral bis-squaramides
作者:Nagaraju Molleti、Vinod K. Singh
DOI:10.1039/c5ob00105f
日期:——
bis-squaramide catalyzed conjugate addition of 2-hydroxy-1,4-naphthoquinone to 2-enoylpyridines. Some of the Michael products have been successfully converted into various enantioenriched pyranonaphthoquinone derivatives. The protocol is further extended to the synthesis of various 4-hydroxycoumarinderivatives under mild conditions.
Diastereo- and enantioselective direct vinylogous Michael addition of γ-substituted butenolides to 2-enoylpyridines catalyzed by chiral bifunctional amine-squaramides
The diastereo- and enantioselectivedirectvinylogousMichaeladdition reaction of [gamma]-substituted butenolides to 2-enoylpyridines has been achieved. A range of [gamma],[gamma]-disubstituted butenolide derivatives, bearing two consecutive tri- and tetrasubstituted stereogenic...
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
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.