Hydrochloric Acid → HCID 59378889, compound

Participants

Reaction Conditions

Reaction Steps

(R)-6-(3-fluorophenylsulfanyl)-1,2,3,4-tetrahydronaphthalen-1-methylamine hydrochloride salt (4.6 kg) and urea (3.4 kg) were suspended in fresh NMP (9.5 kg). Concentrated aqueous 37% HCl (0.15 kg) was added and the reaction mixture was heated to 100° C. for three hours. On completion of reaction (confirmed by HPLC), the reaction mixture was cooled to 60° C. and water (45 kg) was added. The resulting slurry was stirred vigorously while cooling down to 20° C., and the mixture was allowed to sit for 24 hours. The resulting solid was filtered and washed with water. The wet filter cake was taken into toluene (23.6-kg) and heated to 80° C., then washed with water (twice with 13.5 L) and the reaction mixture was cooled to 40° C. [(R)-6-(3-Fluoro-phenylsulfanyl)-1,2,3,4-tetrahydro-naphthalen-1-ylmethyl]-urea crystallized on addition of n-heptane (7.8 kg). The product was filtered and dried under reduced pressure at 50° C. to afford 3.78-kg of [(R)-6-(3-fluoro-phenylsulfanyl)-1,2,3,4-tetrahydro-naphthalen-1-ylmethyl]-urea: MP=115.1-116.0° C.; MS (M+1)=288; H1 NMR (300 MHz): δ ppm (DMSO): 1.59-1.84 (3H, m), 2.59-2.78 (2H, m), 2.86 (1H, m), 3.10 (1H, ddd, J=6.03, 9.04 Hz), 3.28 (1H, ddd, J=5.65, 6.03), 3.34 (1H, s), 5.46 (2H, s, NH), 6.11 (1H, t, J=6.03 Hz) 6.96-7.09 (3H, m), 7.17-7.23 (2H, m), 7.26-7.31 (1H, m), 7.32-7.41 (1H, m): [α]D=25.5° (MeOH). Chiral Assay (Area Norm): Column: Chiralpak AS-H (150×4.6 mm), mobile phase 80/20 hexane/ethanol(isocratic), flow rate 0.7 ml/min, 25° C., uv @230 nm.: (R)-isomer 99.03/(S)-isomer 0.97.

Provenance & Evidence