Verfahren zur Herstellung von in 3-Stellung substituierten Indolen

1,167,563. lndole derivatives. A. H. ROBINS CO. Inc. 6 Oct., 1966 [13 June, 1966], No. 25960/69. Divided out of 1,167,562. Heading C2C. Novel 3 - (2 - substituted ethyl) - indoles of the general formula wherein R is a hydrogen atom, a C 1-8 alkyl or C 1-9 alkanoyl group, a benzoyl group optionally substituted by fluorine, chlorine or bromine atoms or C 1-3 alkyl, C 1-3 alkoxy or trifluoromethyl groups, a phenyl group optionally substituted by fluorine, chlorine or bromine atoms or C 1-3 alkyl, C 1-3 alkoxy or trifluoromethyl groups, a phenyl-C 1-8 alkyl group or a C 3-9 cycloalkyl group; R 1 is a hydrogen atom, a C 1-8 alkyl group or a phenyl group optionally substituted as indicated above; R 2 is a hydrogen, fluorine, chlorine or bromine atom or a trifluoromethyl, hydroxyl, C 1-8 alkyl or C 1-8 alkoxy group or a phenyl-C 1-8 alkoxy group in which the phenyl moiety is optionally substituted as indicated above; R 3 is a hydrogen atom or a methyl group, no more than one methyl group being present as R 3 ; R 4 is a hydrogen atom, a C 1-8 alkyl group, a phenyl- C 1-8 alkyl group or a phenyl group optionally substituted as indicated above; A is a hydrogen atom, a C 1-9 alkanoyl group, a phenyl group optionally substituted as indicated above, a benzoyl group optionally substituted as indicated above or a phenyl-carbamoyl group in which the phenyl moiety is optionally substituted as indicated above; m is 0 or 1; n is 1, 2 or 3; p is 0 or 1, and when p is 0 the dotted line represents a carbon-carbon single bond; provided that when m is 0, one R 3 is a methyl group and/or R 4 is a C 1-8 alkyl or phenyl- C 1-8 alkyl group, and when m is 1, p is 0, and acid addition and quaternary ammonium salts thereof are prepared (a) by metal hydride reduction of a 1 - (indol-3-ylglyoxyloyl)-3-substituted pyrrolidine or -4-substituted piperidine of the general formula wherein R is a hydrogen atom, a C 1-8 alkyl group, a phenyl group optionally substituted as indicated above, a phenyl-C 1-8 alkyl group or a C 3-9 cycloalkyl group and A is a hydrogen atom or a phenyl group optionally substituted as indicated above; (b) by reaction of a 3-(2- hydroxyethyl)-indole of the general formula with a thionyl halide and reaction of the resulting 3.(2.haloethyl).-indole of the general formula wherein X is a halogen atom, with a heterocyclic amine of the general formula or (c) by dehydration of a 3-(2-substituted ethyl)-indole of the first general formula above wherein A is a hydrogen atom and