((吡啶-3-基)甲氧基)芳酸衍生物的合成及抗血小板聚集活性

以具有活血化瘀作用的中药有效成分阿魏酸为先导物,按生物电子等排原理,设计合成了6个((吡啶-3-基)甲氧基)芳酸衍生物,其结构经IR,1H NMR,13C NMR及MS确证.体外药效筛选结果显示,部分((吡啶-3-基)甲氧基)芳酸衍生物对二磷酸腺苷(ADP)诱导的血小板聚集具有较好的抑制活性,其中化合物1a的抑制作用明...     

新型2,6,9-三取代嘌呤衍生物的合成及抗血小板凝集活性

以9-乙酰氧基乙基-2-丙硫基-6-氯嘌呤化合物(1)为原料,经烷胺化和玻沃-布兰还原制得2-(6-烷氨基-2-丙硫基-9H-嘌呤-9-基)乙醇(2a~2d); 2a~2d与二苄基磷酰氯反应制得2-(6-烷氨基-2-丙硫基-9H-嘌呤-9-基)乙基二苄基磷酸酯(3a~3d); 3a~3d与三甲基溴硅烷反应合成了2-(6-烷氨基-2-丙硫基-9H-嘌呤-9-基)乙基磷酸二氢酯化合物(4a~4d)，化合物3与化合物4均为新化合物，其结构经¹H NMR, ¹³C NMR, ³¹P NMR, IR和HR-MS（ESI）表征。研究了3a~3d, 4a~4d的抗血小板凝集活性。结果表明：含有磷酸基团的嘌呤化合物活性明显优于不含磷酸基团嘌呤化合物的活性,其中4b活性最好，抗血小板凝集活性为17.79%。     

新型6-氟-4(3H)-喹唑啉酮类Schiff碱的合成及其抑菌活性

以2-氨基-5-氟苯甲酸为起始原料，与醋酐酰化关环制得6-氟-2-甲基噁嗪-4-酮(1)； 1在80%水合肼中回流反应制得6-氟-2-甲基-3-氨基-4(3H)-喹唑啉酮(2)； 2分别与羟基芳醛和杂环芳醛反应合成了6个6-氟-4(3H)-喹唑啉酮类Schiff碱（3a~3f），其中3b~3f为新化合物，其结构经¹H NMR， ¹³C NMR， IR和元素分析表征。采用琼脂扩散法研究了3a~3f对大肠杆菌、金黄色葡萄球菌和枯草杆菌的抑制活性。结果表明：用药浓度为400 μg·mL^-1时，3a~3f对受试菌种均有一定的抑制活性，其中6-氟-2-甲基-3-(4-吡咯苯亚甲氨基)-4(3H)-喹唑啉酮(3c)抑菌活性最强，对大肠杆菌和枯草杆菌的抑菌圈直径分别为9.38 mm和9.00 mm。     

新型含哌嗪-磺酰胺的2(5H)-呋喃酮类化合物的合成及其抗癌活性

以糠醛为原料,经氧化、醚化和重结晶制得5-甲氧基-3,4-二溴-2(5H)-呋喃酮（4）; 4与哌嗪经Michael加成消除反应制得5-甲氧基-4-哌嗪基-3-溴-2(5H)-呋喃酮（5）; 5与取代磺酰氯经磺酰化反应合成了7 个新型的含哌嗪-磺酰胺的2(5H)-呋喃酮类化合物(7a~7g),其结构经¹H NMR, ¹³C NMR, IR和HR-MS表征。初步的生物活性研究(MTT法)表明,7a~7g均能显著抑制人宫颈癌Hela细胞的增殖,其中5-甲氧基-4-(对乙酰氨基苯磺酰基-哌嗪基)-3-溴-2(5H)-呋喃酮（7f）的抑制活性最佳,其IC₅₀为0.03 μM(24 h)。     

新型1-取代-3-(4-甲氧基苯基)脲衍生物的合成及其生物活性

以对甲氧基苯胺和固体三光气为起始原料,制得4-甲氧基苯异氰酸酯（1）; 1与取代胺（2a~2i）反应合成了9个新型的1-取代-3-(4-甲氧基苯基)脲衍生物（3a~3i）,其结构经¹H NMR, ¹³C NMR和HR-MS表征。用黄瓜子叶扩张法和小麦芽鞘法研究了3a~3i的生物活性。结果表明：1-（4-甲氧基苯基)-3-［3-（三氟甲基)苯基］脲(3c)的生长素活性最好。在用药浓度为10 mg·L^-1时,3c的生长素活性为29.8%,优于β-吲哚乙酸（29.3%）。     

（E）-3-{4-[（3，5，6-三甲基吡嗪-2-基）甲氧基]-芳基}丙烯酸的合成

以川芎嚷为起始原料,经溴化,O-烷基化和Knoevenagel缩合反应合成了2个(E)-3-{4-[(3,5,6-三甲基吡嗪-2-基)甲氧基]-芳基}丙烯酸类化合物,其结构经1H NMR,13C NMR,IR和MS表征.     

超声辅助合成新型二氢嘧啶-2(1H)-硫酮衍生物及其生物活性研究

以苯乙酮与取代苯甲醛（1a~1e）为起始原料，在碱性条件下制得中间体查尔酮(2a~2e)；在超声辅助下，合成了一系列硫代嘧啶酮类化合物（3a~3e），其中3a、 3d和3e为新化合物，其结构经¹H NMR, ¹³C NMR, IR和MS(ESI)表征。研究了3a~3e对酪氨酸酶和α-葡萄糖苷酶的抑制活性及抗氧化活性。结果表明：4-(2-甲氧基苯基)-6-苯基-3,4-二氢嘧啶-2(1H)=硫酮（3b）抑制酪氨酸酶活性最好，IC₅₀为0.676 mmol·L^-1，与阳性对照曲酸相当。以3b为例进行了抑制酪氨酸酶动力学与分子对接研究。结果表明：3b为竞争型抑制剂，苯环可能为其活性基团。     

含哌啶酮结构单元的姜黄素类似物的合成及其诱导癌细胞凋亡活性

以邻甲氧基苯甲醛为原料,经羟醛缩合反应合成了6个单羰基姜黄素类似物（1a~1f）,其结构经¹H NMR和¹³C NMR确证。采用MTT法研究了1a~1f对人肺癌细胞A549和NCI-H460的抑制活性。结果表明：大部分化合物的活性显著优于天然产物姜黄素。其中3,5-二(2-甲氧基苯亚甲基)-4-哌啶酮（1d）可促进细胞活性氧的产生,对A549有诱导凋亡效果。     

新型双环吡啶类化合物的合成及其抗血小板活性

以卤代物(1a~1d、 5a~5j)为起始原料,经硫脲盐酸盐(2a~2d)、磺酸钠(6a~6e)或磺酸(6f~6j)的氯代和氨解反应,制得相应的磺酰胺片段(4a~4d、 8a~8j)。 1-Boc-4-甲基-4-哌啶甲酸(9)脱保护基后与吡啶类化合物(11)发生亲核取代反应制得中间体1-（3-氰基-5-氧代-5,7-二氢呋喃[3,4-b]吡啶-2-基）-4-甲基哌啶-4-羧酸(12); 12与磺酰胺片段发生缩合反应合成了相应的双环吡啶类化合物(13a～13n),其结构经¹H NMR, ¹³C NMR和MS(ESI)表征。采用比浊法血小板聚集试验研究了13a～13n对人源血小板聚集的抑制作用。结果表明：13c和13g具有一定的抗血小板聚集活性,其中化合物13g的IC₅₀值为44.08 μM。      

新型蒎酸基双酰腙类化合物的合成及其除草活性

以α-蒎烯为原料,经氧化和溴仿反应制得蒎酸(3)。在HATU作用下,3和Boc肼发生N-酰化反应得含Boc保护基的蒎酸基双酰肼(4);4脱除Boc保住基得蒎酸基双酰肼(5);5与取代苯甲醛经缩合反应合成了6个新型的蒎酸基双酰腙类化合物(6a~6f),其结构经1H NMR,13C NMR,IR,ESI-MS和元素分析表征。初步的除草活性测试表明,6a~6f在用药量为100μg·mL-1时对油菜胚根生长具有一定的抑制作用,其中蒎酸基双苯酰腙(6b)和蒎酸基双对氟苯酰腙(6d)的抑制率分别为70.1%和73.2%。     

An Efficient Synthesis of Optically Pure (R)- and (S)-2-(aminomethyl)alanine ((R)- and (S)-ama) and (R)- and (S)-2-(aminomethyl)leucine ((R)- and (S)-aml)

An efficient synthesis of enantiomerically pure (R)- and (S)-2-(aminomethyl)alanine ((R)- and (S)-Ama) 1a and (R)- and (S)-2-(aminomethyl)leucine ((R)- and (S)-Aml) 1b is described (Schemes 1 and 2). Resolution of the racemic amino acids was achieved using L -phenylalanine cyclohexylamide ( 2 ) as chiral auxiliary. The free amino acids 1a, b were converted to the N^α-Boc,N^γ-Z-protected derivatives 11a, b (Scheme 3) ready for incorporation into peptides. Based on the three crystal structures of the diastereoisomeric peptides 8a, 8b , and 9b , the absolute configurations in both series were determined. β-Turn type-I geometries were observed for structures 8b and 9b , whereas 8a crystallized in an extended backbone conformation.     

OH(3) (-) and O(2)H(5) (-) double Rydberg anions: predictions and comparisons with NH(4) (-) and N(2)H(7) (-)

A low barrier in the reaction pathway between the double Rydberg isomer of OH(3) (-) and a hydride-water complex indicates that the former species is more difficult to isolate and characterize through anion photoelectron spectroscopy than the well known double Rydberg anion (DRA), tetrahedral NH(4) (-). Electron propagator calculations of vertical electron detachment energies (VEDEs) and isosurface plots of the electron localization function disclose that the transition state's electronic structure more closely resembles that of the DRA than that of the hydride-water complex. Possible stabilization of the OH(3) (-) DRA through hydrogen bonding or ion-dipole interactions is examined through calculations on O(2)H(5) (-) species. Three O(2)H(5) (-) minima with H(-)(H(2)O)(2), hydrogen-bridged, and DRA-molecule structures resemble previously discovered N(2)H(7) (-) species and have well separated VEDEs that may be observable in anion photoelectron spectra.     

Bis(trifluoroacetyl) peroxide, CF(3)C(O)OOC(O)CF(3)

Pure, highly explosive CF(3)C(O)OOC(O)CF(3) is prepared for the first time by low-temperature reaction between CF(3)C(O)Cl and Na(2)O(2). At room temperature CF(3)C(O)OOC(O)CF(3) is stable for days in the liquid or gaseous state. The melting point is -37.5 degrees C, and the boiling point is extrapolated to 44 degrees C from the vapor pressure curve log p = -1875/T + 8.92 (p/mbar, T/K). Above room temperature the first-order unimolecular decay into C(2)F(6) + CO(2) occurs with an activation energy of 129 kJ mol(-1). CF(3)C(O)OOC(O)CF(3) is a clean source for CF(3) radicals as demonstrated by matrix-isolation experiments. The pure compound is characterized by NMR, vibrational, and UV spectroscopy. The geometric structure is determined by gas electron diffraction and quantum chemical calculations (HF, B3PW91, B3LYP, and MP2 with 6-31G basis sets). The molecule possesses syn-syn conformation (both C=O bonds synperiplanar to the O-O bond) with O-O = 1.426(10) A and dihedral angle phi(C-O-O-C) = 86.5(32) degrees. The density functional calculations reproduce the experimental structure very well.     

Mixed ligand titanium(IV) complexes. Chlorobis(dithiocarbamato)bis(methylsalicylato)titanium(IV) andbis(dithiocarbamato)bis(methylsalicylato)titanium(IV)

Summary Dichlorobis(methylsalicylato)titanium(IV) reacts with potassium or amine salts of dialkyl or diaryl dithiocarbamates in 11 and 12 molar ratios in anhydrous benzene (room temperature) or in boiling CH₂Cl₂ to yield mixed ligand complexes: (AcOC₆H₄O)₂ Ti(S₂CNR₂)Cl (1) and (AcOC₆H₄O)₂ Ti(S₂CNR₂)₂ (2), R=Et, n-Pr, n-Bu, cyclo-C₄H₈ and cyclo-C₅H₁₀. These compounds are moisture sensitive and highly soluble in polar solvents. Molecular weight measurement in conjunction with i.r.,¹H and¹³C n.m.r. spectral studies suggest coordination number 7 and 8 around titanium(IV) in (1) and (2) respectively.