O-Xylene → Lurasidone

Participants

Reaction Conditions

Reaction Steps

100 g (3aR,7aR)-4′-(benzo[d]isothiazol-3-yl)octahydrospiro[isoindole-2,1′-piperazin]-1′-ium mesylate of Formula (G) and 55 g (3aS,4R,7S,7aR)-hexahydro-4,7-methano-1H-isoindole-1,3-(2H)-dione of Formula (E), 55 g potassium carbonate, 400 mg dibenzo-18-crown-ether and 1000 mL xylene were added to round bottom flask at 25 to 35° C. The reaction mass was heated to 130° C. to 140° C. and stirred for 3 hours and cooled to 65° C. The reaction mixture was filtered and washed with 50 mL of xylene. The wet-cake was treated with 200 mL xylene at 65° C. for 30 min. The reaction mixture was cooled to 25° C. and filtered. The filtrate was washed with water and separated organic layer was dried over sodium sulfate, charcoalized and distilled under vacuum below 70° C. to obtain residue. The residue was treated with 200 mL isopropanol at 80 to 85° C. The reaction mass cooled to 25 to 35° C. and cooled to 0 to 5° C. The product was filtered and washed with isopropanol to afford the title compound as lurasidone free base of Formula (H). X-ray powder diffraction pattern (FIG. 3), DSC (FIG. 4).

Provenance & Evidence