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该文"一锅煮"合成13C标记甘氨胆酸。即以氯甲酸异丁酯为活化试剂,甘氨酸-1-13C和胆酸直接缩合制备甘氨胆酸-甘氨酰基-1-13C,合成产品使用HPLC、LC-MS和1HNMR等进行分析。优化的合成条件为:n(氯甲酸异丁酯)∶n(胆酸)∶n(甘氨酸)∶n(三乙胺)=1∶1∶1∶1,反应温度10℃,反应时间1 h,13C标记甘氨胆酸收率82.4%(以甘氨酸-1-13C计),13C丰度达99.1%atom13C,光学纯度99.2%,w(甘氨胆酸-甘氨酰基-1-13C)=97.7%。 相似文献
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以乙酸-2-~(13)C与N,N'-羰基二咪唑为原料,反应得到中间体N-乙酰基咪唑-2-~(13)C,该中间体进一步与对氨基苯酚反应得到对乙酰氨基酚-2-~(13)C。考察了反应温度和反应时间对对乙酰氨基酚-2-~(13)C收率的影响。结果表明:合成产物的最佳反应温度和时间分别为40℃和12h。产物经GC-MS、FTIR、1HNMR和~(13)CNMR进行结构表征。对乙酰氨基酚-2-~(13)C的气相色谱纯度99%,同位素丰度为98.7%,总产率为87%,合成的产物可作为同位素内标物在定量分析测试中使用。 相似文献
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2-13C1-乙酸与N,N''-羰基二咪唑反应得到了中间体13C1-N-乙酰基咪唑(—CO13CH3),该中间体进一步与对氨基苯酚反应得到13C1-对乙酰氨基酚(—CO13CH3)。考察了反应温度和反应时间两个因素对13C1-对乙酰氨基酚收率的影响。结果表明,合成产物的最佳反应温度和时间分别为40 ℃和12 h。产物经GC-MS、FTIR、1HNMR和13CNMR进行结构表征及含量测定。化学纯度>99%,同位素丰度>98.7%,总产率为87%,标记合成的产物可作为同位素内标物在定量分析测试中使用。 相似文献
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以丰度为98.7 atom%的Na15NO2为同位素原料,与硫酸二甲酯反应合成了硝基甲烷-15N,方法简便,同位素转化率为75%,纯度为98.8%,丰度为98.56 atom%。 相似文献
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4-(N-异丙氨基)-苯甲酸的合成研究 总被引:1,自引:0,他引:1
对分子中既具有吸电子基,又具有给电子基的化合物4-(N-异丙氨基)-苯甲酸进行了合成,具体的合成步骤和反应条件为:50mL水中加入3g(0.022mol)对氨基苯甲酸,再加入无水碳酸钾1.5g(0.011mol),调整pH约为8,使成羧酸盐,经过滤后加入2-溴丙烷2.5g(0.02mol),加热回流12h,直至下层的2-溴丙烷基本消失,冷却,得灰白色固体,重结晶并用活性炭脱色,得白色晶体4-(N-异丙氨基)-苯甲酸。 相似文献
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曲大伟 《精细与专用化学品》2007,15(24):10-11
将植物油经醇解、精馏制得油酸甲酯,然后加成、消除、水解制得9-炔十八酸粗品,最后重结晶得成品。成品熔点48℃,纯度可达98.5%以上。 相似文献
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Oxygenated derivates of cholesterol and lanosterol, known as oxysterols, have consistently displayed significant activity as inhibitors of 3-hydroxy-3-methylglutaryl (HMG) CoA reductase, a key regulatory enzyme in sterol biosynthesis. We have developed the chemical syntheses of ring C oxysterols for evaluation as inhibitors of sterol biosynthesis. A key intermediate in the chemical synthesis was 3beta-benzoyloxy-9alpha, 1alpha-epoxy-5alpha-cholest-7-ene (1), whose structure was confirmed by X-ray crystallographic analysis and is presented herein. 相似文献
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Dhimant Desai Jacek Krzeminski Jyh-ming Lin Anju Chadha Naoki Miyata Haruhiko Yagi 《Polycyclic Aromatic Compounds》2013,33(1-4):255-264
Like other PAHs, chrysenes are thought to exert their carcinogenicity via metabolic activation of proximally carcinogenic dihydrodiols to diol epoxides as ultimate carcinogens. Benzo[c] chrysene (B[c]C) is structurally intriguing among the PAH because it features both a bay region and a fjord region. Although B[c]C is carcinogenic and mutagenic, few data are available on its metabolic activation or the nature of its metabolites. We have synthesized the B[c]C trans-1,2-, 7,8-, and 9,10-dihydrodiols from the appropriate methoxy-substituted bisnaphthyl olefins by photochemical cyclization. B[c]C was metabolized with S9 liver fraction from phenobarbital/β-naphthoflavone-treated rats. Dihydrodiols were formed on both terminal rings as well as in the K-region. 2-, 3-, and 10-HydroxyB[c]C were also identified as metabolites. In mutagenicity studies toward S. typhimurium TA100, 1,2-dihydrodiol was more mutagenic than B[c]C at doses above 1.25 μg/plate, whereas 9,10-dihydrodiol was toxic at doses above 1.25 μg/plate. 相似文献