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in contrast to the formation of 1,4- dihydro compounds from reduction of nicotinamide adenine dinucleotide(NAD﹢) in biological systems, chemical reduction of pyridinium salts gives different reduction products depending on the reducing agents and substrates.However, the mechanism of the reductions has not been fully understood. Therefore, it would be of interest to study the reduction of N-arylpyridinium salts,in which aryl groups with various substituents differing in electronic effect can be easily incorporated,and to compare their reduction products. It is also known that some of 1,2-dihydroquinolines isomerize to the corresponding 1,4-isomers. The study on the isomerization of N-aryldihydropyridines is expected to give valuable informations on the factors underlying the process. 与此相反的是在生物系统中1,4一二氢烟酰胺化合物来自腺嘌呤二核苷酸（NAD﹢）的还原，吡啶盐的化学还原得出不同的还原产物，这是根据还原剂和基板而定。然而，这一机制还没有得到完全理解。因此，这将有兴趣研究N – 烷基吡啶盐的还原，这与不同的电子效应在各种取代芳基也很容易整合，'并比较其还原产物。这也是众所周知，1,2- dihydroquinolines一些异构相应的1,4-异构体。对N – 烷基吡啶异构化研究预计放弃这一进程的基本因素，有价值的信息。 |
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2楼2011-02-28 11:04:39
houlu666(金币+2, 翻译EPI+1): 2011-02-28 12:12:29
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in contrast to the formation of 1,4- dihydro compounds from reduction of nicotinamide adenine dinucleotide(NAD﹢) in biological systems, chemical reduction of pyridinium salts gives different reduction products depending on the reducing agents and substrates.However, the mechanism of the reductions has not been fully understood. Therefore, it would be of interest to study the reduction of N-arylpyridinium salts,in which aryl groups with various substituents differing in electronic effect can be easily incorporated,and to compare their reduction products. It is also known that some of 1,2-dihydroquinolines isomerize to the corresponding 1,4-isomers. The study on the isomerization of N-aryldihydropyridines is expected to give valuable informations on the factors underlying the process. 与生物系统中腺嘌呤二核苷酸（NAD﹢）的还原生成1,4一二氢烟酰胺化合物相反，吡啶盐的化学还原得到不同的还原产物，这依还原剂和底物而定。然而，这一还原机理还没有得到完全了解。因此，研究具有不同电子效应的各种取代芳基在N – 烷基吡啶盐的还原中的协同效应并比较其对应的还原产物，这将是一个令人感兴趣的研究。众所周知，一些1,2- 二氢奎宁异构体可异构为相应的1,4-异构体。对N – 芳基二氢吡啶异构化研究有望获得影响异构化过程的基本因素的有价值的信息。 |
3楼2011-02-28 11:25:50
4楼2011-02-28 11:27:55
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