Synthetic Utility of tert-Butyl Azidoacetate on the Hemetsberger-Knittel Reaction. Synthetic Studies of Indoles and Related Compounds. Part 47.

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The synthetic utility of tert-butyl azidoacetate (7) on the Hemetsberger-Knittel reaction is described. The following two findings are disclosed by using tert-butyl azidoacetate (7) : i) in the first step for the synthesis of ethyl indole-2-carboxylate 4, the aldol reaction of less reactive aldehydes 1a, b was improved greatly; ii) tert-butyl indole-2-carboxylate 10 becomes readily available from aldehydes.

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