A process for preparing cis-6-phenyl-5- [4- (2-pyrrolidin-1-yl-ethoxy) -phenyl] -2-methoxy 5,6,7,8-tetrahydronaphthalene hydrochloride, comprising said cis-6-phenyl -5- [4- (2-pyrrolidin-1-yl-ethoxy) -phenyl] -2-methoxy-5,6,7,8-tetrahydronaphthalene hydrochloride contains less than 2.5% of 1- {2- [4- (6- methoxy-2-phenyl-naphthalen-1-yl) -phenoxy] -ethyl} -pyrrolidine hydrochloride, the method, in the following order, the steps of: (a) charging a hydrogenation reaction vessel with a catalyst suitable hydrogenation and a solution of 1- {2- [4- (6-methoxy-2-phenyl-3,4-dihydro-1-yl) phenoxy] ethyl} pyrrolidine hydrochloride in a suitable solvent; (B) pressurizing the hydrogenation reaction vessel with hydrogen to a pressure of 137.9 to 689.4 kPa to provide a hydrogenation reaction mixture; (B) (c) heating the hydrogenation reaction mixture of step (b) at a temperature of 45 to 55 until it is 1% or less of 1- {2- [4- (6-methoxy-2- phenyl-3,4dihidronaftaleno-1 yl) phenoxy] ethyl} pyrrolidine hydrochloride remains to provide cis-6-phenyl-5- [4- (2-pyrrolidin-1-yl-ethoxy) -phenyl] -2-methoxy-5,6,7 , 8-tetrahydronaphthalene hydrochloride: (d) isolating the cis-6 phenyl-5- [4- (2-pyrrolidin-1-yl-ethoxy) -phenyl] -2-methoxy-5,6,7,8-tetrahydronaphthalene hydrochloride in wherein the cis-6-phenyl-5- [4- (2-pyrrolidin-1-yl-ethoxy) phenyl] -2-methoxy-5,6,7,8-tetrahydronaphthalene hydrochloride contains less resulting 2.5% 1 {2- [4- (6-methoxy-2-phenyl-naphthalen-1-yl) phenoxy] -ethyl} -pyrrolidine hydrochloride.
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