Studies on the syntheses of heterocyclic compounds. Part 865. A novel synthesis of indole derivatives by intramolecular nucleophilic aromatic substitution
作者:Tetsuji Kametani、Tatsushi Ohsawa、Masataka Ihara
DOI:10.1039/p19810000290
日期:——
Cyclisation of N-(2-bromo-4,5-dimethoxyphenethyl)acetamide (6) afforded 1-acetyl-2,3-dihydro-5,6-dimethoxy-1H-indole (13) by intramolecular nucleophilic aromatic substitution using sodium hydride and cuprous halide in dimethylformamide. The dihydroindoles (14), (15), and (16) were also synthesised from the corresponding amides (8) and (10) and the carbamate (12) in a similar manner. The dihydroindoles
环化ñ - (2-溴-4,5-二甲氧基苯乙基)乙酰胺(6),得到1-乙酰基-2,3-二氢-5,6-二甲氧基-1- ħ -吲哚使用(13)通过分子内的亲核芳族取代钠二甲基甲酰胺中的氢化物和卤化亚铜。还以类似方式由相应的酰胺(8)和(10)以及氨基甲酸酯(12)合成二氢吲哚(14),(15)和(16)。通过氧化和随后的碱水解,将二氢吲哚(13),(14)和(16)以优异的产率转化为吲哚(20)和(21)。还可以在相似的反应条件下由苯基乙酰胺(24)和(25)制备2-氧吲哚(26)和(27)。