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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. Óë´ËÏà·´µÄÊÇÔÚÉúÎïϵͳÖÐ1,4Ò»¶þÇâÑÌõ£°·»¯ºÏÎïÀ´×ÔÏÙàÑßʶþºËÜÕËᣨNAD©€£©µÄ»¹Ô£¬ßÁà¤ÑεĻ¯Ñ§»¹ÔµÃ³ö²»Í¬µÄ»¹Ô²úÎÕâÊǸù¾Ý»¹Ô¼ÁºÍ»ù°å¶ø¶¨¡£È»¶ø£¬ÕâÒ»»úÖÆ»¹Ã»Óеõ½ÍêÈ«Àí½â¡£Òò´Ë£¬Õ⽫ÓÐÐËȤÑо¿N ¨C Íé»ùßÁà¤ÑεĻ¹Ô£¬ÕâÓ벻ͬµÄµç×ÓЧӦÔÚ¸÷ÖÖÈ¡´ú·¼»ùÒ²ºÜÈÝÒ×ÕûºÏ£¬'²¢±È½ÏÆä»¹Ô²úÎï¡£ÕâÒ²ÊÇÖÚËùÖÜÖª£¬1,2- dihydroquinolinesһЩÒì¹¹ÏàÓ¦µÄ1,4-Òì¹¹Ìå¡£¶ÔN ¨C Íé»ùßÁà¤Òì¹¹»¯Ñо¿Ô¤¼Æ·ÅÆúÕâÒ»½ø³ÌµÄ»ù±¾ÒòËØ£¬ÓмÛÖµµÄÐÅÏ¢¡£ |
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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. ÓëÉúÎïϵͳÖÐÏÙàÑßʶþºËÜÕËᣨNAD©€£©µÄ»¹ÔÉú³É1,4Ò»¶þÇâÑÌõ£°·»¯ºÏÎïÏà·´£¬ßÁà¤ÑεĻ¯Ñ§»¹ÔµÃµ½²»Í¬µÄ»¹Ô²úÎÕâÒÀ»¹Ô¼ÁºÍµ×Îï¶ø¶¨¡£È»¶ø£¬ÕâÒ»»¹Ô»úÀí»¹Ã»Óеõ½ÍêÈ«Á˽⡣Òò´Ë£¬Ñо¿¾ßÓв»Í¬µç×ÓЧӦµÄ¸÷ÖÖÈ¡´ú·¼»ùÔÚN ¨C Íé»ùßÁà¤ÑεϹÔÖеÄÐͬЧӦ²¢±È½ÏÆä¶ÔÓ¦µÄ»¹Ô²úÎÕ⽫ÊÇÒ»¸öÁîÈ˸ÐÐËȤµÄÑо¿¡£ÖÚËùÖÜÖª£¬Ò»Ð©1,2- ¶þÇâ¿üÄþÒì¹¹Ìå¿ÉÒ칹ΪÏàÓ¦µÄ1,4-Òì¹¹Ìå¡£¶ÔN ¨C ·¼»ù¶þÇâßÁà¤Òì¹¹»¯Ñо¿ÓÐÍû»ñµÃÓ°ÏìÒì¹¹»¯¹ý³ÌµÄ»ù±¾ÒòËØµÄÓмÛÖµµÄÐÅÏ¢¡£ |
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