Abstract: An indoline derivative having the formula ##STR1## is produced by a cyclization of 2-halogenophenethylamine having the formula ##STR2## wherein R.sub.1 represents a hydrogen atom or a lower alkyl, a lower alkoxyl, nitro or hydroxyl group; R.sub.2 represents a hydrogen atom or a lower alkoxyl or nitro group; and R.sub.3 represents a hydrogen atom, a lower alkyl, a substituted lower alkyl or a substituted amino group; and X represents a halogen atom in the presence of a copper type catalyst and an amine which is selected from the group consisting of (1) compounds having the formulaR.sub.3-n NH.sub.nwherein R represents a C.sub.1-16 alkyl group or C.sub.1-8 alkoxy group; n is 0 to 2 and R can be the same or different in the case of n is 1 or 0; (2) compounds having the formulaH.sub.2 N(CH.sub.2).sub.n NH andH.sub.2 N(CH.sub.2).sub.n NH(CH.sub.2).sub.n NH.sub.