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1.自对-双(2-羟乙基)氨基苯甲酸乙酯(Ⅺ)开始合成对-双[2-溴(或碘)乙基]-氰基-ω-溴代苯乙酮一六甲撐四胺盐(Ⅵ,Ⅶ)。2.巳合成对-乙氧甲酰氨基-ω-溴代苯乙酮-六甲撐四胺盐(Ⅷ)和对-乙氧甲酰氨基-ω-溴代苯乙酮的异硫脲盐(Ⅸ)。3.化合物Ⅵ,Ⅶ在组织培养试验中对HeLa细胞具显著的抑制作用,Ⅷ,Ⅸ的作用较弱。 相似文献
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采用反相高效液相色谱-质谱(HPLC-MS)联用技术分析了沙田柚果肉汁提取液中呋喃香豆素类化合物.沙田柚果肉汁用乙酸乙酯和正己烷的混合液(体积比5:3)萃取,有机层经硅胶柱色谱分离后得若干个组分,用HPLC-MS对各组分进行定性鉴定.结果表明沙田柚果肉汁中含有6',7'-二羟基香柠檬素(6',7'-dihydroxybergamottin,6',7'-DHB)、香柠檬素(bergamottin)、5-甲氧基呋喃香豆素(bergapten)、5-甲氧基-8-异戊烯氧基呋喃香豆素(phellopterin)、6',7'-环氧香柠檬素(6',7'-epoxybergamottin)及二聚体对氧呋喃香豆素-6',7'-二羟基香柠檬素(简称FC574)6种呋喃香豆素类化合物.并经HPLC-MS/MS进一步验证了其化合物结构. 相似文献
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1.本文叙述了从2,4-二硝基苯甲醛开始经过七步反应合成6-[双-(β-氯乙基)-氨基]-吲哚-2-羧酸(Ⅵb). 2.从相应的硝基吲哚-2-羧酸(Ⅶa和Ⅶb)经还原,羟乙基化,氯化,水解制成5-[双-(β-氯乙基)-氨基]-吲哚-2-羧酸(Ⅵa)和7-[双-(β-氯乙基)-氨基]-吲哚-2-羧酸(Ⅵc). 3.制备了双-(β-氯乙基)-吲哚-2-甲酰胺(ⅩⅥ),吲哚-2-甲酰-乙烯亚胺(ⅩⅦ)和3-碘代吲哚-2-羧酸(ⅩⅧ)业已制备. 相似文献
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多甲氧基菲-9-甲酸及酯是合成娃儿藤生物碱及其类似物的关键中间体.以4-(3,4-二甲氧基苯亚甲基)-6,7-二甲氧基-3-异色酮(6)为底物,2,3-二氯-5,6-二氰基苯醌(DDQ)/CH3SO3H作为氧化体系,没有得到预期的多甲氧基菲-9-甲酸内酯(1),意外产物经核磁共振等确定为两个新的3-取代苯基香豆素2,3.进一步的实验研究显示:底物发生分子内脱氢偶联为香豆素2而非菲环化合物1,是因为异色酮6苯环A上2位取代基的存在所致,其内酯环开环化合物10以及2,3-二苯基丙烯酸(12)的对比实验印证了该取代基对脱氢偶联反应选择性的影响;异色酮6氧化偶联为香豆素2的反应机理可能为酸解开环以及途经自由基正离子的脱氢偶联,香豆素3为DDQ氧化2的前体化合物8所得. 相似文献
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等由酮的一氰乙基化产物水解后得到的δ-酮酸,在大量乙酐或者乙酰氯存在下合成了不饱和δ-内酯.我们用4-异丁酰基庚二酸(1)在过量醋酸酐及乙酰氯存在下回流5h得到7-氧代-8,8-二甲基-△~9-六氢香豆素(2). 相似文献
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本文报告脱二甲胺地霉红(Ⅰ)合成工作中两种有用中间体4-甲基-8-甲氧基萘酚-[1](Ⅵ)和1,8-二甲氧基-4-甲基萘甲酸-[2](Ⅶ)的合成以及其结构的证明。 4-甲基-8-甲氧基萘酚-[1](Ⅳ)可从两条途径合成:其一由8-甲氧基萘酚-[1](Ⅱ)经Gattermann醛合成及黄鸣龙改良Kishner-Wolff还原法而得。另一途径由2-氯-5-甲氧基苯甲酰氯(Ⅷ)经八步反应,首先获得4-甲基-5-氯-8-甲氧基四氢萘酮-[1](ⅩⅥ),其中每步反应都分离得到纯粹的产物。将ⅩⅥ经溴化,脱溴化氢及氢解反应便生成化合物(Ⅳ)。从这两途径所得的最后产物(Ⅳ)性质完全相同。 1,8-二甲氧基-4-甲基萘甲酸-[2](Ⅶ)乃由化合物Ⅳ引入溴原子,甲基化后,经金属-卤素的交换及羧基化而得。Ⅶ的结构证明如下;化合物(ⅩⅥ)经二溴化及脱溴化氢、甲基化后,生成1,8-二甲氧基-2-溴-4-甲基-5-氯萘(ⅩⅩ),另一方面,将Ⅵ氯化以期获得ⅩⅩ,却得到2,4-二氯-5-甲基-7-溴-8-甲氧基萘酚-[1](ⅩⅪ)。由于将ⅩⅩ氯化亦得到ⅩⅪ,化合物Ⅵ中溴的位置得到证明,因此Ⅶ的结构也予以肯定。 相似文献
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超高效液相色谱-四极杆-飞行时间质谱法快速筛查化妆品中18种香豆素类化合物 总被引:1,自引:0,他引:1
建立了化妆品中18种香豆素类化合物(二氢香豆素、7-羟基香豆素、6-甲氧基-7-羟基香豆素、6,7-二甲氧基香豆素、香豆素、7-甲氧基香豆素、4-甲基-7-羟基香豆素、补骨脂素、8-甲氧基补骨脂素、7-甲基香豆素、异补骨脂素、5-甲氧基补骨脂素、4-甲基-7-乙氧基香豆素、欧前胡素、2',4,8-三甲基补骨脂素、8-羟基补骨脂素、异欧前胡素、环香豆素)的超高效液相色谱-四极杆-飞行时间质谱快速筛查方法。膏霜、水剂、香波、散粉、唇膏等不同类型的化妆品样品经超声提取后,样品提取液高速离心处理,浓缩上清液,以Oasis HLB固相萃取柱净化,经Waters ACQUITY UPLC BEH C18色谱柱(150 mm×2.1 mm,1.7μm)在10min内完成有效分离后,采用大气压化学电离-四极杆-飞行时间质谱进行筛查分析。18种香豆素类化合物的定量下限为10~60μg/kg。在低、中、高3个加标水平的平均回收率为85.2%~95.1%,相对标准偏差为3.2%~8.6%。该方法准确、快速、灵敏,为化妆品样品的高通量快速筛查提供了可靠实用的技术手段。 相似文献
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4-氟-1,2-二氢-3,6-哒嗪二酮及其衍生物的合成 总被引:2,自引:0,他引:2
本文报导了4-氟-1,2-二氢-3,6-哒嗪二酮(Ⅱ)及其衍生物3,6-二氯-4-氟哒嗪(Ⅲ)、3-甲氧基-4-氟-6-氯哒嗪(Ⅳ)、3-邻甲苯氧基-4-氟-6-氯哒嗪(Ⅵ)、1-苯基-3-羟基-4-氟-6-哒嗪酮(Ⅶ)等五种新化合物的合成,探讨了(Ⅲ)同亲核试剂的反应性能和部分化合物的药理实验结果. 相似文献
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23种挥发性有机化合物在3种吸附剂上漏出容量的测定评价 总被引:4,自引:0,他引:4
采用吸附热解吸-气相色谱-质谱法对23种挥发性有机化合物Chromosorb 106、Tenax TA、Tenax TG等3种吸附剂上漏出容量进行了测定。根据实验结果确定了不同的化合物应选择不同的吸附剂及相应的采样体积。结果表明,Chromosorb 106可较好地吸附低沸点的挥发性有机化合物,Tenax TA、Tenax TG均可用于沸点较高的挥发笥有机化合物吸附,这对测定大气中的有机化合物含量采样有一定的参考价值。 相似文献
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Siim Salmar Jaak J?rv Tiina Tenno Ants Tuulmets 《Central European Journal of Chemistry》2012,10(5):1600-1608
Kinetic data for organic reactions in various binary water-organic solvent mixtures were collected and quantitatively analysed in terms of linear-free-energy relationships by using tert-butyl chloride (2-chloro-2-methylpropane) solvolysis as the reference system. Linear similarity plots for these kinetic data were determined for solvent systems ranging from pure water mixtures up to considerable amount of cosolvent, and 161 similarity coefficients were calculated from slopes of these plots. The existence of these linear plots demonstrated that the solvent effects are of some common nature in all analysed reaction mixtures independent of the reaction type and the cosolvent used. Therefore it was concluded that the observed effects could be connected to the specific solvating properties of water, which govern reactivity even in significant dilution of water by an organic cosolvent. This conclusion was supported by the linear interrelationship between the slopes of similarity plots of different reactions, and hydrophobicity parameters log P of the reacting compounds. The relative solvent effects observed in binary water-organic solvent mixtures were for the first time directly related to the structure of reacting compounds. 相似文献
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Fernández-Alvarez M Lores M Llompart M García-Jares C Cela R 《Analytical and bioanalytical chemistry》2007,388(5-6):1235-1247
In the present study, solid-phase microextraction in photochemical studies was used to investigate UV light induced photodegradation
of five pyrethroids (empenthrin, transfluthrin, allethrin, phenothrin and cyphenothrin) and a synergist (piperonyl butoxide),
which are common ingredients of household insecticides. Gas chromatography coupled with mass spectrometry was used to separate
and tentatively identify the parent compounds and their corresponding photoproducts generated in the same polydimethylsiloxane
fibre. Kinetics curves were obtained and apparent first-order rate constants and half-lives were estimated. Twenty-six photoproducts
were tentatively identified and photodegradation pathways for the compounds investigated were proposed. It is a matter of
some concern that three of the photoproducts identified [(3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid, 3-phenoxybenzaldehyde
and (3-phenoxyphenyl)methanol] have been reported to be endocrine disruptors. There is no record of previous studies of cyphenothrin
and empenthrin photodegradation, and therefore the present study represents the first attempt to elucidate the photochemical
behaviour of these compounds.
Figure Photo-SPME for Pyrethroids 相似文献
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KONG De-Nian XIE Zai-Lai LI Jian-Rong FENG Mei-Ling HUANG Xiao-Ying 《结构化学》2009,28(11):1373-1380
Two lanthanide selenite-carboxylate (LSC) compounds, namely, [Ln8(SeO3)4(2,6- pdc)8(H2O)10]·2H2O (Ln = Pr 1, Sm 2; 2,6-pdcH2 = pyridine-2,6-dicarboxylic acid) have been hydrothermally synthesized and structurally characterized. Both compounds possess two-dimensional layer structures constructed by Ln8(SeO3)4(2,6-pdc)8(H2O)10 clusters connected to each other via bridging carboxylate groups. The structures are further extended into three-dimensional architectures through extensive inter-layer H-bonding between coordinated water molecules and carboxylate groups. The luminescent properties and thermal stability of both compounds have been investigated. 相似文献
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利用大口径毛细管气相色谱法测定液化气中的含硫化合物 总被引:5,自引:0,他引:5
利用大口径毛细管色谱柱、不分流进样、氢焰离子化检测器(FID)、双火焰光度检测器(DFPD),与气相色谱-质谱(GC-MS)联用技术相结合,对脱硫后的液化气进行测定,成功地鉴定出17种含硫化合物。该法简便、快速,对含硫化合物的检测灵敏度高。 相似文献