Synthesis and transformations of ethyl 3-(benzoylamino)-1H-indole-2-carboxylates.

[摘要]：A no. of Et 3-(benzoylamino)-1H-indole-2-carboxylates were prepd. by heating Et 2-(benzoylamino)-3-(phenylhydrazono)propanoates with polyphosphoric acid. The reaction of Et 3-(benzoylamino)-5-chloro-1H-indole-2-carboxylate with hydrazine hydrate resulted in the formation of the debenzoylated hydrazide. Hydrolysis of the same ester with aq. sodium hydroxide afforded 3-(benzoylamino)-5-chloro-1H-indole-2-carboxylic acid, which on heating underwent a decarboxylation reaction to give N-(5-chloro-1H-indol-3-yl)benzamide.

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