Preparation of indoles and oxindoles from N-(tert-butoxycarbonyl)-2-alkylanilines

…, JM Muchowski, LE Fisher, LA Flippin, DB Repke…

Index: Clark; Muchowski; Fisher; Flippin; Repke; Souchet Synthesis, 1991 , # 10 p. 871 - 878

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Citation Number: 53

Abstract

Treatment of dilithiated N-(terl-butoxycarbonyl) anilines 1 with dimethylformamide or carbon dioxide furnishes intermediates 3, 5, that are easily converted to N-(tert-butoxycarbonyl) indoles 4 and oxindoles (indol-2 (3H)-ones, 7). respectively. Condensation of dilithiated 1 with N-methoxy-N-methylamides provides ketones 9 which are cyclized upon trifiuoroacetic acid treatment to either 2-substituted 1-(tert-butoxycarbonyl) indoles 10 or 2-substituted ...