8-喹啉磺酸乙酯、异丙酯的气相热解反应

采用PM3半经验方法和从头算密度泛函方法(B3LYP)研究了8-喹啉磺酸乙酯、异丙酯的气相热解反应机理,结果表明,此类反应经历两个基元反应步骤,第一步反应是通过一个紧密离子对过渡态的非同步的协同反应过程,其中乙基和异丙基碳正离子中的β-H原子帮助碳正离子和磺酸负离子的分离,C-O键的断裂是决定此反应的反应速度的关键。生成的8-喹啉磺酸继续进行分子内的酸碱中和反应。在B3LYP/6-311+G(2d,p)水平计算所得反应活化能分别为151.2 kJ.mol-1、137.9 kJ.mol-1,与相应的实验值相一致。

Microwave assisted synthesis of novel Hantzsch 1,4-dihydropyridines,acridine-1,8-diones and polyhydroquinolines bearing the tetrazolo[1,5-α]quinoline moiety and their antimicrobial activity assess

Microwave assisted efficient Hantzsch reaction via four-component coupling reactions of tetrazolo[1,5-α]quinoline-4-carbal-dehyde, dimedone/cyclohexane-1,3-dione,ethyl/methyl acetoacetate and ammonium acetate was described as the preparation of tetrazolo[1,5-α]quinoline based 1,4-dihydropyridines,acridine-1,8-diones and polyhydroquinolines.The process presented here is simple,rapid,environmentally welcoming and high yielding.All the derivatives were subjected to an in vitro antimicrobial screening against a representative panel of bacteria and fungi and results worth further investigations.

UPLC-MS/MS法测定阿加曲班中4个基因毒性杂质

目的:建立超高效液相色谱-串联质谱法(UPLC-MS/MS)同时测定阿加曲班中4个基因毒性杂质:3-甲基-8-喹啉磺酸、3-甲基-8-喹啉磺酸甲酯、3-甲基-8-喹啉磺酸乙酯、3-甲基-8-喹啉磺酰氯。方法:采用Waters ACQUITY UPLC BEH C18(100 mm×2.1 mm,1.7μm)色谱柱;以0.1%甲酸水溶液为流动相A,乙腈为流动相B进行线性梯度洗脱;流速0.2 mL·min^-1;采用ESI离子源正离子模式,多反应监测模式下,以外标法对4个基因毒性杂质同时进行定量测定。结果:除3-甲基-8-喹啉磺酰氯外,其他3个基因毒性杂质质量浓度在0.125~500 ng·mL^-1范围内线性关系良好;低、中、高3个浓度的加样回收率(n=3)范围为91.5%~104.2%,RSD范围为0.15%~4.6%;检测下限范围为0.042~1.667 ng·mL^-1,定量下限范围为0.125~5.000 ng·mL^-1。样品中均未检出杂质。结论:本方法操作简便,结果可靠,经方法学验证,可用于阿加曲班中4个基因毒性杂质的同时检测。