Patent GB-1215751-A (GB)
Title: Amino-substituted cyclopentyl-phenol ethers and process for preparing them
IPC: A61K31/135
Filed: 1968-03-11
Abstract: 1,215,751. Amine-substituted cyclopentyl phenol ethers. FARBWERKE HOECHST A.G. 11 March, 1968 [10 March, 1967; 8 Dec., 1967], No. 11758/68. Heading C2C. The invention compounds of the Formula I in which the cyclopentyl ring may contain a double linkage in the 2,3-position and R represents a branched aliphatic or cycloaliphatic hydrocarbon radical, C 3-6 , in the racemic and optically active forms and salts of both forms thereof. They are prepared by reacting 1,2 - epoxy - 3 - [2<SP>1 </SP>- cyclopentyl (or cyclopentenyl) - phenoxy 3 - propane with an amine of the formula H 2 -N-R where R is as defined above, or by reacting a compound of the Formula II, A-O-CH 2 -CHOH-CH 2 X, in which A is a 2-cyclopentyl (or cyclopentenyl)- phenyl radical, X represents a halogen atom, the sulphuric acid radical -OSO 3 H or a sulphonic acid radical, with the amine H 2 -N-R, or by reacting 1 - amino - 2 - hydroxy - 3- [21 - cyclopentyl (or cyclopentenyl) - phenoxy 3-propane with either a compound of Formula R-X, where X is as defined above, or with an aliphatic or cycloaliphatic ketone containing 3 to 6 carbon atoms and simultaneously or subsequently reducing the condensation product, or by reducing the ketone of the general Formula III in which A and R are as defined above, or by reacting 2-cyclopentyl (or cyclopentenyl)-phenol with a compound of the formula in which X and R are as defined above in the presence of an acid-binding agent, or by hydrolysing the acyl group and/or splitting off the benzyl groups in a compound of the Formula IV in which R is defined as above, R 1  represents hydrogen, an acyl group or the benzyl group and R 2  represents hydrogen or the benzyl group, but in which R 1  and R 2  cannot simultaneously represent hydrogen. The cyclopentyl coinpounds can also be prepared by hydrogenating the corresponding cyclopentenyl compounds. The optically active isomers of the compounds of Formula I may be obtained by clearing the racemic compounds of Formula I with optically active acids e.g. D-(-)-mandelic acid. 1,2 - Epoxy - 3 - [2<SP>1 </SP>- cyclopentyl (or #<SP>2</SP>- cyclopentenyl) - phenoxy] - propane is prepared from the corresponding phenol and epichlorohydrin. 1 - Chloro - 2 - hydroxy - 3 - [2<SP>1 </SP>- cyclopentyl (or #<SP>2</SP> - cyclopentenyl) phenoxy] - propane is prepared from the corresponding 1,2-epoxy compound and hydrogen chloride. 1 - (N - isopropyl - N - benzylamino) - 2- hydroxy - 3 - (2<SP>1</SP> - cyclopentyl - phenoxy) - propane is prepared by reacting the 1,2-epoxy compound with N-isopropyl-N-benzyl amine. 3 - Isopropyl - 5 - (2<SP>1</SP> - cyclopentyl - phenoxymethyl) - oxazolidone - (2) is prepared by cyclising 1 - (N - carbomethoxy - N - isopropylamino) - 2 - hydroxy - 3 - (2<SP>1</SP> - cyclopentylphenoxy) -propane. 1 - Amino - 2 - hydroxy - 3 - (21 - cyclopentylphenoxy)-propane is prepared by reacting the 1,2-epoxy compound with ammonia. 1 - Isopropylamino - 2 - oxo - 3 - (2<SP>1</SP>- cyclopentyl-phenoxy)- propane is prepared by oxidizing 1 - chloro - 2 - hydroxy - 3 - (2<SP>1</SP>- cyclopentylphenoxy)-propane with chromic acid followed by reaction with isopropylamine. Pharmaceutical compositions comprising as active ingredient a compound of Formula I or pharmaceutically acceptable salt thereof together with a pharmaceutically acceptable carrier are administered orally or parenterally and have antagonistic activity towards the #- receptors of the adrenergic nervous system.