reduced to 4,5,6,7-tetrahydro-2H-isoindoles. Isoindole 24 was also reduced to a mixture of an isoindoline and a 4,5,6,7-tetrahydro-2H-isoindole. In contrast, 2,3-dihydro-1H-indoles 21 underwent dehydrogenation to give thermodynamically stable indoles. Theoretical calculations show the significant difference in aromaticity between isoindoles and indoles, corresponding to the observed differences in reactivities
制备了取代的1,3-二氢-
2H-异吲哚(2,
异吲哚啉),并进行了
钯催化的
甲酸还原。烷基
异吲哚啉被还原为4,5,6,7-四氢-
2H-异吲哚(1)。对于5-甲氧基
异吲哚啉仅观察到部分还原,并且4-甲氧基-,5-碳甲氧基-,
氨基和酰胺基
异吲哚啉对该反应是惰性的。将卤素取代的
异吲哚啉脱卤并还原为4,5,6,7-四氢-
2H-异吲哚。异
吲哚24也被还原为
异吲哚啉和4,5,6,7-四氢-
2H-异吲哚的混合物。相反,2,3-二氢-1 H-
吲哚21进行脱氢反应得到热力学稳定的
吲哚。理论计算表明,异
吲哚和
吲哚之间的芳香性存在显着差异,与观察到的反应性差异相对应。在
NBS和空气存在下,将四氢-2 H-异
吲哚1氧化为
4,5,6,7-四氢异吲哚-1,3-二酮。