[CH3:1][NH:2][CH2:3][CH2:4][C@@H:5]([C:7]1[S:8][CH:9]=[CH:10][CH:11]=1)[OH:6].F[C:13]1[C:22]2[C:17](=[CH:18][CH:19]=[CH:20][CH:21]=2)[CH:16]=[CH:15][CH:14]=1.CC(C)([O-])C.[K+]>CS(C)=O>[CH3:1][NH:2][CH2:3][CH2:4][C@H:5]([O:6][C:21]1[CH:20]=[CH:19][CH:18]=[C:17]2[CH:16]=[CH:15][CH:14]=[CH:13][C:22]=12)[C:7]1[S:8][CH:9]=[CH:10][CH:11]=1(S)-(−)-3-methylamino-1-(2-thienyl)-propan-1-ol (20.0 g) and 1-fluoronaphthalene (68.3 g) were charged into a 4-neck round bottomed flask. Potassium tert-butoxide (13.1 g) and DMSO (36.0 g) were then added, and the resulting mixture was heated to 60° C. for 8 hours. After completion of the reaction, the reaction mixture was cooled down and washed with water. Layers were separated, and the organic layer was further extracted with 32% HCl(aq) (14.7 g) to separate Duloxetine® from 1-floronaphthalene. The acidic aqueous layer was adjusted to pH 12-13 with 45% NaOH(aq) (17.6 g) to obtain Duloxetine® in a free base form as an oily liquid (31.3 g, 90%). Optical purity of the resulting Duloxetine® measured by chiral HPLC was 95% e.e.
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