[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]2[CH2:13][CH2:12][S:11][NH:10][C@@H:9]2[C:14]2[CH:19]=[CH:18][C:17]([Cl:20])=[CH:16][CH:15]=2)[CH:5]=[CH:6][CH:7]=1.C(=O)([O-])[O-].[Cs+].[Cs+].I[CH:28]([CH3:30])[CH3:29]>CN(C=O)C.O>[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]2[CH2:13][CH2:12][S:11][N:10]([CH:28]([CH3:30])[CH3:29])[C@@H:9]2[C:14]2[CH:15]=[CH:16][C:17]([Cl:20])=[CH:18][CH:19]=2)[CH:5]=[CH:6][CH:7]=1To a solution of 1.21 g (3.40 mmol) of (3S,4R)-4-(3-chlorophenyl)-3-(4-chlorophenyl)-1,2-thiazinan (Example 117, Step C) in DMF (8.5 mL) was added cesium carbonate (4.31 g, 13.23 mmol), followed by 2-iodopropane (2.9 mL, 29.0 mmol). The resulting mixture was heated at 85° C. for 23 hours. After cooling to room temperature, the reaction mixture was diluted with water and extracted with ethyl acetate. The combined organic layers were washed with sat. NaCl solution, dried over Na2SO4, filtered and the filtrate was concentrated. Purification by flash chromatography on silica gel (0 to 2% MeOH in DCM gradient) provided the title compound as a white solid.
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