Procedure for the production of indole derivatives of formula I, **(See formula)** wherein R1 means a hydrogen atom or a methyl, lower alkenyl or lower alkynyl radical, R2 means a lower alkenyl or lower alkynyl radical and R3 means a hydrogen atom or a methyl radical, with the proviso that when R1 already means be it a lower alkenyl radical or lower alkynyl radical, R1 and R2 must be identical, and their acid addition salts, characterized in that an aminomethyl indole of formula II is treated in an inert organic solvent, **(See formula)** where R signifies a hydrogen atom or a methyl radical and R3 has the meaning indicated above, with an alkenylation or alkynylation agent and, when it is desired to produce an acid addition salt, it is salified with an organic or inorganic acid. (Machine-translation by Google Translate, not legally binding)
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