用色谱—质谱和质量以谱研究苯甲酸钐热分解反应

为合成某些芳香族有机化合物提供一种新途径，用色谱－质谱联用技术和质量色谱法研究了苯甲酸钐的热分解反应产物。其热分解产物溶入丙酮后有大量９，１０－蒽醌析出，其丙酮溶液中还含有１，２－二苯甲酰基苯（２５．６％）、苯甲酸（１８．７％）、二苯酮（１４．４％）、９－勿酮（８．２％）、９－苯甲勿（４．９％）、取苯（３．６％）、二苯甲烷（２．３％）、３－甲酰苯基联苯（２．１％）、二苯基乙二酮（１．９％）、４－甲     

6,7—取代—1H—苯并（de）异喹啉—1,3（2H）二酮的合成

从二氢苊出发合成了６－溴－７－氨基２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮，６－甲氧基－７－氨基－２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮和６，７－二氨基－２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮，测定了它们的荧光量子产率，讨论了分子内重原子溴和给电子基对化合物荧光性质的影响。     

噻吩甲酰三氟丙酮和4,5-二氮芴-9-酮及4,5-二氮芴-9-酮连氮铕(Ⅲ)三元配合物的合成和表征

合成了Ｅｕ（ＴＴＡ）３Ｌ１（Ⅰ）和［Ｅｕ（ＴＴＡ）３］２Ｌ２（Ⅱ）二种新的铕（Ⅲ）三元配合物（ＴＴＡ＝噻吩甲酰三氟丙酮一价阴离子、Ｌ１＝４，５－二氮芴－９－酮、Ｌ２＝４，５－二氮芴－９－酮连氮）。用元素分析、ＩＲ、ＵＶ和溶液荧光光谱对配合物进行了表征。探讨了溶剂对Ｅｕ（Ⅲ）三元配合物荧光光谱的影响，发现在ＣＨ３ＣＮ中Ｅｕ（Ⅲ）三元配合物发光效果最好，而溶剂ＤＭＦ会使配合物荧光减弱     

人体组织中微量稀土总量的分光光度法测定

本文研究了人体结缔组织灰化的最优化条件，经１－苯基－３－甲基－４－苯甲酰基－吡唑酮－［Ｓ］（ＰＭＢＰ）萃取富集稀土后，采用２－４（－氯－２－膦酸基苯偶氮）－１，８－二羟基－３，６－萘二磺酸（ＣＰＡ－ＭＡ）显色反应测定了人体牙、骨及动物内脏、血液中稀土元素含量。     

半合成头孢菌素和青霉素新衍生物的研究

将５－芳基－２Ｈ－四唑乙酰氯分别和头孢菌素母体７－ＡＣＡ，７－ＡＤＣＡ以及青霉素母体６－ＡＰＡ反应制得９种７β（５－芳基－２Ｈ－四唑乙酰胺基）头孢菌素衍生物和１种６β（５－芳基－２Ｈ－四唑乙酰胺基）青霉素衍生物，将２－苯基－４－喹啉甲酰氯分别和７－ＡＣＡ、７－ＡＤＣＡ及６－ＡＰＡ反应制得２种７β（２－苯基－４－（喹啉甲酰胺基）头孢菌素化合物，１种６β（２－苯基－４－喹啉甲酰胺基）青霉素衍生物。粗产     

铽与4—酰代吡唑啉酮—5的三元配合物的合成与荧光性质

合成并表征了一系列铽与含不同４－酰代的１－苯基－３－甲基－吡唑啉酮－５的三元配合物Ｔｂ９Ｌ）３．２Ｈ２Ｏ和Ｔｂ（Ｌ）３．Ｄｉｐｙ「Ｌ＝１－苯基－３－甲基－４－乙酰基吡啥林酮－５（ＰＭＡＰ），１－苯基－３－甲基－４－丙酰基吡唑啉酮－５（ＰＭＰＰ），１－苯基－３－甲基－４－异丁酰基吡唑啉酮－５（ＰＭＩＢＰ），１－苯基－３－甲基－４－特戊酰基吡唑啉酮－５（ＰＭＰＶＰ），１－苯基－３－甲基－４－苯甲酰基吡     

萘酰亚胺类共聚色素的合成

以６－溴－１Ｈ，３Ｈ－萘并［１，８－ｃｄ］吡喃－１，３－二酮为原料，经亚胺化、Ｕｌｍａｍｎ缩合后与丙烯酰氯酯化得到具有荧光的可聚合单体６－（Ｎ－丙烯酰氧乙基）氨基－２－（２ ’，４ ’－Ｎ，Ｎ－二甲基）苯基－１Ｈ－苯并［ｄｅ］异喹啉－１，３（２Ｈ）－二酮，它与甲基丙烯酸甲酯经自由基共聚得到具有强烈荧光的聚合色素。     

3－苯基－5－取代苯氨基－6－甲基－1，2，4－三嗪的合成

３－苯基－５－取代苯氨基－６－甲基－１，２，４－三嗪的合成陆忠娥，曾润生，席海涛（苏州大学化学系，苏州，２１５００６）关键词硫代苯甲酰胺，α－乙酰基硫代甲酰苯胺，Ｎ＇－氨基苯甲脒，３－苯基－５－取代苯氨基－６－甲基－１，２，４－三嗪１，２，４－三嗪类...     

有机化学试题选登

有机化学试题选登一、完成下列反应二、合成１．自苯合成２－苯基吲哚２．自硝基苯合成６，６’联喹啉３．自丙二酸二乙酯及必要试剂合成２－甲基－４－异丙基１，３环己二酮４．自丙二酸二乙酯及必要试剂合成β－（３－环己烯基）丙酸５．自乙酰乙酸乙酯合成４－甲基－４...     

三（3－苯基－4－苯甲酰基异噁唑酮－5）－乙醇－水合铕三元配合物的合成、表征及晶体结构

合成了三（３－苯基－４－苯甲酰基异唑酮－５）－乙醇－水合铕的配合物。有关鉴定和元素分析结果表明：该配合物的分子式为［Ｅｕ（ＰＢＩ）３（Ｃ２Ｈ５ＯＨ）（Ｈ２Ｏ）］·Ｈ２Ｏ，其中３－苯基－４－苯甲酰基异唑酮－５简记为ＨＰＢＩ，是一种新型高酸度的β－双酮。用Ｘ射线单晶衍射法测定了［Ｅｕ（ＰＢＩ）３（Ｃ２Ｈ５ＯＨ）（Ｈ２Ｏ）］·Ｈ２Ｏ的晶体结构，结果表明，该晶体属单斜晶系，Ｐ２１／ａ空间群，晶胞参数：ａ＝１．５５８６（９）ｎｍ，ｂ＝２．１２９７（７）ｎｍ，ｃ＝１．６０４（１）ｎｍ，β＝１１７．９７（５）°，Ｖ＝４．７０３（９）ｎｍ３，Ｚ＝４．中心离子铕为八配位，其配位多面体为畸变的双帽三棱柱。配位的８个氧原子分别来自３个ＰＢＩ配体中的６个氧、１个溶剂化乙醇分子中的氧和１个水分子中的氧，Ｅｕ—Ｏ配位键平均键长０．２３９１（４）ｎｍ。晶体结构中还存在１个未配位的水分子。该水分子、配位水分子、乙醇分子与配体ＰＢＩ中的Ｎ原子之间均存在强的氢键作用。同一ＰＢＩ基团内配位氧之间的平均距离为０．２８０８ｎｍ。     

Phenylpropanoid glycosides from Rhodiola rosea

Rhodiola rosea L. (Golden Root) has been used for a long time as an adaptogen in Chinese traditional medicine and is reported to have many pharmacological properties. Along its known secondary metabolites tyrosol (1), salidroside (rhodioloside) (2), rosin (3), rosarin (4), rosavin (5), sachaliside 1 (6) and 4-methoxy-cinnamyl-O-beta-D-glucopyranoside (7), four compounds were isolated from aqueous methanol extract of the plant and identified as cinnamyl-(6'-O-beta-xylopyranosyl)-O-beta-glucopyranoside (8), 4-methoxy-cinnamyl-(6'-O-alpha-arabinopyranosyl)-O-beta-glucopyranoside (9), picein (10) and benzyl-O-beta-glucopyranoside (11) by UV, MS and NMR methods. Compounds 8 and 9 are new natural compounds whereas compounds 10 and 11 were isolated first time from R. rosea. Also the compounds 6 and 7 are isolated earlier only from the callus cultures of the plant but not from the differentiated plant.     

Quinolactacins revisited: from lactams to imide and beyond

Chemical analysis of a solid phase fermentation of an Australian Penicillium citrinum strain has returned all known examples of a rare class of N-methyl quinolone lactams, quinolactacins A2 (1), B2 (2), C2 (3) and A1 (4), together with the new quinolactacins B1 (5), C1 (6), D1 (7) and D2 (8), and the novel derivatives quinolonimide (9) and quinolonic acid (10). Complete stereostructures were assigned to all these compounds by detailed spectroscopic analysis and chemical interconversion. Carefully controlled and monitored decomposition studies have confirmed that quinolactacins readily undergo C-3 epimerization and oxidation, and under appropriate conditions convert to quinolonimide and quinolonic acid. Mechanisms for key transformations are proposed. The decomposition studies suggested that only quinolactacins A2 (1) and B2 (2) are genuine natural products, with all other isolated compounds being decomposition artefacts. Quinolactacins C1 (6), C2 (3), and the racemic mixture of quinolactacins D1/D2 (8/7) all displayed notable cytotoxic activity.     

Titanocene-phosphine derivatives as precursors to cytotoxic heterometallic TiAu2 and TiM (M = Pd, Pt) compounds. Studies of their interactions with DNA

A series of tri- and bimetallic titanium-gold, titanium-palladium, and titanium-platinum derivatives of the general formulas [Ti{η(5)-C(5)H(4)(CH(2))(n)PPh(2)(AuCl)}(2)]·2THF [n = 0 (1); n = 2 (2); n = 3 (3)] and [TiCl(2){η(5)-C(5)H(4)κ-(CH(2))(n)PPh(2)}(2)(MCl(2))]·2THF [M = Pd, n = 0 (4); n = 2 (5); n = 3 (6) ; M = Pt, n = 0 (7); n = 2 (8); n = 3 (9)] have been synthesized and characterized by different spectroscopic techniques and mass spectrometry. The molecular structures of compounds 1-9 have been investigated by means of density functional theory calculations. The calculated IR spectra of the optimized structures fit well with the experimental IR data obtained for 1-9. The stability of the heterometallic compounds in deuterated solvents [CDCl(3), dimethyl sulfoxide (DMSO)-d(6), and mixtures 50:50 DMSO-d(6)/D(2)O and 1:99 DMSO-d(6)/D(2)O at acidic and neutral pH] has been evaluated by (31)P and (1)H NMR spectroscopy showing a higher stability for these compounds than for Cp(2)TiCl(2) or precursors [Ti{η(5)-C(5)H(4)(CH(2))(n)PPh(2)}(2)]. The new compounds display a lower acidity (1-2 units) than Cp(2)TiCl(2). The decomposition products have been identified over time. Complexes 1-9 have been tested as potential anticancer agents, and their cytotoxicity properties were evaluated in vitro against HeLa human cervical carcinoma and DU-145 human prostate cancer cells. TiAu(2) and TiPd compounds were highly cytotoxic for these two cell lines. The interactions of the compounds with calf thymus DNA have been evaluated by thermal denaturation (1-9) and by circular dichroism (1, 3, 4, and 7) spectroscopic methods. All of these complexes show a stronger interaction with DNA than that displayed by Cp(2)TiCl(2) at neutral pH. The data are consistent with electrostatic interactions with DNA for TiAu(2) compounds and for a covalent binding mode for TiM (M = Pd, Pt) complexes.     

厚皮树树皮的化学成分研究

采用各种柱色谱法从厚皮树(Lannea coromandelica)树皮的78%乙醇提取物中分离得到9个化合物。通过理化性质和波谱数据鉴定为:槲皮素-3-O-芸香糖苷(1),豆甾-4-烯-6β-醇-3-酮(2),蒲公英赛酮(3),蒲公英赛醇(4),乙酰蒲公英赛醇(5),5α-豆甾烷-3,6-二酮(6),β-谷甾醇(7),β-胡萝卜苷(8),香草醛(9)。除了化合物(7),其他化合物都是从该植物中首次分离得到。     

Antioxidant, anti-glycation and anti-inflammatory activities of phenolic constituents from Cordia sinensis

Nine compounds have been isolated from the ethyl acetate soluble fraction of C. sinensis, namely protocatechuic acid (1), trans-caffeic acid (2), methyl rosmarinate (3), rosmarinic acid (4), kaempferide-3-O-β-D-glucopyranoside (5), kaempferol-3-O-β-D-glucopyranoside (6), quercetin-3-O-β-D-glucopyranoside (7), kaempferide-3-O-α-L-rhamnopyranosyl (1→6)-β-D-glucopyranoside (8) and kaempferol-3-O-α-L-rhamno-pyranosyl (1→6)-β-D-glucopyranoside (9), all reported for the first time from this species. The structures of these compounds were deduced on the basis of spectroscopic studies, including 1D and 2D NMR techniques. Compounds 1-9 were investigated for biological activity and showed significant anti-inflammatory activity in the carrageen induced rat paw edema test. The antioxidant activities of isolated compounds 1-9 were evaluated by the DPPH radical scavenging test, and compounds 1, 2, 4 and 7-9 exhibited marked scavenging activity compared to the standard BHA. These compounds were further studied for their anti-glycation properties and some compounds showed significant anti-glycation inhibitory activity. The purity of compounds 2-5, 8 and 9 was confirmed by HPLC. The implications of these results for the chemotaxonomic studies of the genus Cordia have also been discussed.     

Synthesis of acyclic nucleoside analogs of 6-substituted 2-aminopurines and 2-amino-8-azapurines

Several new acyclonucleoside purine and 8-azapurine analogs have been prepared from 2-amino-4,6-dichloropyrimidine ( 1 ) and 3-amino-1,2-propanediol ( 2a ) and 4-amino-1-butanol ( 2b ), respectively, as the starting materials. The new target compounds are: 2-amino-6-chloro-9-(2,3-dihydroxypropyl)purine ( 6a ), 2-amino-6-chloro-9-(4-hydroxybutyl)purine ( 6b ), 2-amino-6-chloro-9-(2,3-dihydroxypropyl)-8-azapurine ( 7a ), 2-amino-6-chloro-9-(4-hydroxybutyl)-8-azapurine ( 7b ), 9-(2,3-dihydroxypropyl)-8-azaguanine ( 8a ), 9-(4-hydroxybutyl)-8-azaguanine ( 8b ), 9-(2,3-dihydroxypropyl)-8-azathioguanine ( 9a ), and 9-(4-hydroxybutyl)-8-azathioguanine ( 9b ). Also, the requisite intermediate pyrimidine derivatives, 2,5-diamino-4-(2,3-dihydroxypropylamino)-6-chloropyrimidine ( 5a ) and 2,5-diamino-4-(4-hydroxybutylamino)-6-chloropyrimidine ( 5b ) are novel.     

A new neolignan glycoside from the leaves of Acer truncatum

A new neolignan glycoside, (7R,8R)-7,8-dihydro-9'-hydroxyl-3'-methoxyl- 8-hydroxymethyl-7-(4-hydroxy-3-methoxyphenyl)-1'-benzofuranpropanol 9'-O-beta-D- glucopyranoside (1) was isolated from the leaves of Acer truncatum along with (7R,8R)-7,8-dihydro-9'-hydroxyl-3'-methoxyl-8-hydroxymethyl-7-(4-O-alpha-L-rhamno- pyranosyloxy-3-methoxyphenyl)-1'-benzofuranpropanol (2), schizandriside (3), lyoniresinol (4), berchemol (5), (-)-pinoresinol-4-O-beta-D-glucopyranoside (6), hecogenin (7), chlorogenic acid (8) and neochlorogenic acid (9). Their structures were elucidated on the basis of extensive spectroscopic data. The absolute configuration of compounds 1 was established by its CD spectrum. The antibacterial activities of compounds 1-7 were evaluated.     

GC-MS,LC-MS/MS,Docking and Molecular Dynamics Approaches to Identify Potential SARS-CoV-2 3-Chymotrypsin-Like Protease Inhibitors from Zingiber officinale Roscoe

This study aims to identify and isolate the secondary metabolites of Zingiber officinale using GC-MS, preparative TLC, and LC-MS/MS methods, to evaluate the inhibitory potency on SARS-CoV-2 3 chymotrypsin-like protease enzyme, as well as to study the molecular interaction and stability by using docking and molecular dynamics simulations. GC-MS analysis suggested for the isolation of terpenoids compounds as major compounds on methanol extract of pseudostems and rhizomes. Isolation and LC-MS/MS analysis identified 5-hydro-7, 8, 2′-trimethoxyflavanone (9), (E)-hexadecyl-ferulate (1), isocyperol (2), N-isobutyl-(2E,4E)-octadecadienamide (3), and nootkatone (4) from the rhizome extract, as well as from the leaves extract with the absence of 9. Three known steroid compounds, i.e., spinasterone (7), spinasterol (8), and 24-methylcholesta-7-en-3β-on (6), were further identified from the pseudostem extract. Molecular docking showed that steroids compounds 7, 8, and 6 have lower predictive binding energies (MMGBSA) than other metabolites with binding energy of −87.91, −78.11, and −68.80 kcal/mole, respectively. Further characterization on the single isolated compound by NMR showed that 6 was identified and possessed 75% inhibitory activity on SARS-CoV-2 3CL protease enzyme that was slightly different with the positive control GC376 (77%). MD simulations showed the complex stability with compound 6 during 100 ns simulation time.