Methanesulfonic Acid → (1S,2S)-1-(4-hydroxyphenyl)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-1-propanol mesylate trihydrate

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Reaction Conditions

Reaction Steps

The D-(−)-tartrate salt of (1S,2S)-1-(4-hydroxyphenyl)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-1-propanol (5.0 g, 10.5 mmol), water (17.5 mL), and methanesulfonic acid (1.05 g, 11.0 mmol) were combined in a 50 mL, 3-neck round bottom flask under a nitrogen atmosphere. The slurry was heated to 60-65° C. to give a solution which was then filtered. The filtrate was slowly cooled over 1 hour to 15-20° C. to give a thick white suspension. The slurry was further cooled to 0-5° C. and then granulated at 0-5° C. for 1 hour. The product was filtered, the cake washed with 2.5 mL of cold water (0-5° C.) and then dried at 20-25° C. under nitrogen sweep. (1S,2S)-1-(4-hydroxyphenyl)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-1-propanol mesylate trihydrate (4.53 g) was isolated in 90.4% overall yield as a white crystalline solid. The physical and chemical properties of the isolated trihydrate were identical to an authentic sample. 1H NMR (d6-DMSO) δ9.58 (s, 1H), 8.91 (S, 1H), 7.48 (m, 2H), 7.35 (m, 2,2H), 7.21 (m, 3H), 6.77 (d, J=8.5 Hz, 2H) 6.35 (s, 1H), 5.52 (s, 1H), 4.58 (d, J=8.1 Hz, 1H), 340 (m, 11H) 2.63 (m, 1H), 2.3 (s, 3H), 1.78 (m, 2H), 0.95 (d, J=6.6 Hz, 3H). 13C NMR (d6-DMSO) δ158.13, 148.61, 132.27, 129.27, 128.80, 127.51, 125.26, 115.89, 72.12, 68.89, 66.30, 47.40, 42.91, 35.71, 35.37. Anal. Calcd. for C20H25NO3.CH3SO3H.3H2O: C, 52.81; H, 7.39; N,2.93; S, 6.71. Found: C, 52.77; H, 7.50; N, 2.94; S, 6.96. αD=+54.5° (anhydrous basis).

Provenance & Evidence