4-(Methylsulfanyl)mandelic acid and 2-phenylpyrrolidine (I) are heated in refluxing xylene with azeotropic removal of water. The resulting mandelamide (III) is cyclized in polyphosphoric acid at 100 C to a mixture of two diastereomeric lactams. The desired isomer, the minor component (ca- 35%), is separated by preparative HPLC and reduced with borane tetrahydrofuran to the final product. The perchlorate salt crystallizes from 2-propanol on treatment of the free base with the requisite amount of 70% perchloric acid.
2-Chlorostyrene oxide is condensed with 2-phenylpyrrolidine in refluxing ethanol, and the resultant amino alcohol (II) is cyclized in polyphosphoric acid at 100 C to a mixture of two diastereomeric amines. The desired diastereomer, the minor component (ca. 25%), is separated readily by preparative HPLC. The hydrobromide salt crystallizes from 2-propanol on treatment ot the free base with the requisite amount of 48% HBr.