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The introduction of the alkynyl moiety to the triterpenic core through a linkage to the indole nitrogen is described. The reaction of N-propargylindoles with N-methylpiperazine using Mannich reaction led to propargylaminoalkynyl-triterpenoids, whose structures were established by NMR spectroscopy.

N-Propargylation of Indolo-Triterpenoids and Their Application in Mannich Reaction