A mixture of 5.55 gm (0.0186 mol) of 1-[7,8-dimethoxy-1,3,4,5-tetrahydro-2H-3-benzazepin-2-on-3-yl]-3-chloro-propane, 2.6 ml (0.0886 mol) of triethylamine and 3.9 gm (0.0186 mol) of N-methyl-3-(3,4-dimethoxy-phenyl) propylamine was heated at 85° C. for 4 hours, then cooled and dissolved in methylene chloride/water. The organic phase was separated, extracted with water, dried over magnesium sulfate, concentrated by evaporation in vacuo, and the residue was purified on silica gel, using methylene chloride plus 3% ethanol as the eluant. The oily free base product thus obtained was dissolved in acetone, and the hydrochloride was precipitated with ethereal hydrochloric acid.
