Patent GB-1167563-A (GB)
Title: Novel 3-(2-Substituted Ethyl) Indoles and Processes for Their Manufacture
IPC: A61K31/00
Filed: 1966-10-06
Abstract: 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 p is I, followed optionally by salification. Novel 1 - (indol - 3 - ylglyoxyloyl) - 3 - substituted pyrrolidine or -4-substituted piperidines of the second general formula above are prepared by reaction of an indole-3-glyoxyloyl chloride of the general formula with a heterocyclic amine of the fifth general formula above. Pharmaceutical compositions having an anti- Parkinsonism effect comprise, as active ingredient, a 3-(2-substituted ethyl)-indole of the first general formula above or a pharmaceutically acceptable acid addition or quaternary ammonium salt thereof, together with a pharmaceutically acceptable carrier, and may be administered orally or parenterally.