3-甲基-1-苯基-4-{4-([5-甲基-2-(4-取代芳基)-噁唑-4-基]甲氧基)-芳亚甲(苄)基}-2-吡唑啉-5-酮的设计、合成与降血糖活性

设计合成了具有降血糖活性的3-甲基-1-苯基-4-[4-[[5-甲基-2-(4-取代芳基)-噁唑-4-基]甲氧基]-芳亚甲(苄)基]}-2-吡唑啉-5-酮类化合物.用丁二酮单肟和(取代的)苯甲醛环合、氯化得到氯甲基噁唑衍生物,与对羟基苯甲醛或香兰醛缩合,再与3-甲基-1-苯基-2-吡唑啉-5-酮进行Knoevenagel反应及催化氢化得到目标化合物(Ⅰ和Ⅱ),共合成了16个未见文献报道的新化合物,并利用元素分析、IR、MS和1HNMR确证了化合物的结构.初步药理试验结果表明,所合成的化合物有抑制血糖升高的倾向以及能明显加强和延长外源性胰岛素的降血糖作用,其中化合物Ⅰb,Ⅰd和Ⅰf尤为突出,说明这类化合物可能有增强胰岛素敏感性的作用.     

SYNTHESIS OF DBN AND ITS CATALYTIC PERFORMANCE FOR METHANOL CARBONYLATION TO METHYL FORMATE

1 , 5-diazabicyclo['1, 3, 0]non-5-ene(DBN) has been synthesized in our laboratory, and its catalytic activity and selectivity for methanol carbonylation to methyl formate (MF) have been studied. The experimental results have demonstrated that the synthetic processes of DBN used for the present work are reasonable and feasible. The total yield of three steps of DBN synthsis is approximate to 80%. The activity evaluation has shown that DBN can effectively catalyze the carbonylation reaction of methanol in the presence of propylene oxide (PO) promoter. PO-promoted DBN is a novel catalytic system superior to sodium methoxide.     

Synthesis and Crystal Structure of Ag2（admtrz）2（CF3CO2）2（admtrz=4—amino—3,5—dimethyl—1,2,4—triazole）

1 INTRODUCTION Transition metal complexes bridged by 1, 2, 4-triazole group can produce interesting structures and specific properties[1]. Many attempts have been made to synthesize a variety of complexes with paramagnetic centers by using such ligands, and their structures and magnetic properties have been characterized[2]. However, the polynuclear Ag(I) complexes bridged by 1, 2, 4-triazole have been poorly studied[3]. Recently, we have prepared a series of silver(I) triazole complex…     

超声辐射下金属锰诱发芳香醛的还原偶联

在超声辐射下，Mn-NH4Cl-THF：H2O(1：4，V：V)或Mn-MnCl2-THF:H2O(1：4， V：V)体系中，于室温2-3h内可使芳香醛还原偶联成邻二醇，收率为30％-95％．与 传统方法相比，反应时间缩短，还原剂用量降低，产品收率提高．     

Synthesis and Crystal Structure of 3,3‘—（Hexane—1,6—diyl）bis（1—acetyl—5,5—dimethylhydantoin）,a New Inducer of Differentiation

The title compound C20H30N4O6, Mr = 422.48)was synthesized and its crystal structure was determined by X-ray diffraction method. It crystallizes in the triclinic system, space group P ī with cell parameters: a = 8.330(2), b = 8.468(2), c = 16.017(3) A, α = 97.30(3), β = 92.33(3), γ = 103.94(3)o, V = 1084.7(4) A3, Dc = 1.294 g/cm3, Z = 2, F(000) = 452 and μ = 0.096 mm-1. The structure was refined to R = 0.0483 for 3732 observed reflections with I>2(I) and wR = 0.1335 for 4828 unique reflections. The hydantoin rings are planar and the two ring planes of one molecule are paralleled to each other.     

Über Reaktionen von Nitrosophenolen, 3. Mitt.: Reaktion von 2-Nitroso-1-naphthol mit Resorcin und Orcin

Zusammenfassung Die Reaktion von 2-Nitroso-1-naphthol mit Resorcin bzw. Orcin in Äther bei Anwesenheit von HNO₃ liefert Benzo[c]phenoxazon-(9) (I), Benzo[c]phenoxazon-(9)-12-oxid (II), Methyl-benzo[c]phenoxazon-(9) (III) sowie 11-Methyl-benzo[c]phenoxazon-(9)-12-oxid (IV). Die Struktur der isolierten Substanzen wurde durch Reduktion mittels TiCl₃ sowie durch die UV- und IR-Spektren gestützt.

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The reaction of 2-nitroso-1-naphthol with resorcinol and orcinol in ether solution in the presence of nitric acid has been studied. From the reaction mixture the benzophenoxazones I–IV have been isolated. Structures were assigned on the grounds of UV and IR spectra and partly by using TiCl₃ as a reducing agent.

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Hydrothermal Synthesis and Crystal Structure of Iron Molybdophosphate Fe[Mo_6O_(12)(OH)_3(H_2PO_4)(HPO_4)_2(PO_4)]_2- [Fe(2,2′-bipy)(H_2O)_2]_2[Fe(2,2′-bipy)_3]_2·6H_2O

1 INTRODUCTION Organic-inorganic hybrid materials and polyoxo-metalates have received much attention because of their intriguing structural diversity and potential applications in molecular adsorption, ion exchange, heterogeneous catalysis and nanotech nology as well as in electrical, magnetic and photochemical areas[1, 2]. One of the important ad- vances in the design of new organic-inorganic hybrid materials is utilizing poly- oxometalates’ coordination ability to produce poly- oxoanio…     

非晶态NiP（B）／Al2O3催化一氧化碳，水和氧气合成过氧化氢

Hydrogenperoxideisagreenoxidantwithgreatpotentialformuchapplication .Thepresentproduc tionofhydrogen peroxiderequiressevereconditionsand generates pollutants .AlternativesynthesesarerequiredandthesynthesisofH2 O2 fromCO ,H2 OandO2 isverypromising .AsshowninEq(1) ,thesynthesisisthermodynamicallyfavored :CO +H2 O +O2 H2 O2 +CO2 (1)ΔG02 98=- 134kJ/mol　　ThereactionwasfirstreportedbyZudinetal[1]whousedpalladiumtriphenylphosphaneasacatalyst.Bianchietal[2 ] usedabiphasesystemforthesynthe …     

邻二甲苯…Ar, N2, NH3(ND3)范德华复合物的共振双光子电离光谱

在超声分子束中，使用双光子共振电离光谱技术和飞行时间质谱技术研究了复合物邻二甲苯…Ar．N2，NH3(ND3)．通过理论计算及同位素光谱效应．合理地归属了这些复合物的光谱．并由此获得这些复合物分子问各种模式的振动频率．     

Long‐range π‐type hydrogen bond in dimers CH2?HF,CH2O?H2O,and CH2O?NH3

Using four basis bets, (6‐311G(d,p), 6‐31+G(d,p), 6‐31++G(2d,2p), and 6‐311++G(3df,3pd), the optimized structures with all real frequencies were obtained at the MP2 level for the dimers CH₂O? HF, CH₂O? H₂O, CH₂O? NH₃, and CH₂O? CH₄. The structures of CH₂O? HF, CH₂O? H₂O, and CH₂O? NH₃ are cycle‐shaped, which result from the larger bend of σ‐type hydrogen bonds. The bend of σ‐type H‐bond O…H? Y (Y?F, O, N) is illustrated and interpreted by an attractive interaction of a chemically intuitive π‐type hydrogen bond. The π‐type hydrogen bond is the interaction between one of the H atoms of CH₂O and lone pair(s) on the F atom in HF, the O atom in H₂O, or the N atom in NH₃. In contrast with the above three dimers, for CH₂O? CH₄, because there is not a π‐type hydrogen bond to bend its linear hydrogen bond, the structure of CH₂O? CH₄ is noncyclic shaped. The interaction energy of hydrogen bonds and the π‐type H‐bond are calculated and discussed at the CCSD (T)/6‐311++G(3df,3pd) level. © 2005 Wiley Periodicals, Inc. Int J Quantum Chem, 2005