propan-2-yl hydrogen sulfate

Conditions: temp:75.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1.0N isopropyl sulfuric acid (0.19 mL, 1.04 eq) in IPA was added to a solution of (S)-2-amino-3-(4-(2-amino-6-((R)-1-(4-chloro-2-(3-methyl-1H-pyrazol-1-yl)phenyl)-2,2,2-trifluoroethoxy)pyrimidin-4-yl)phenyl)propanoic acid free base (3.66 mL, 0.05M, 0.183 mmol) in MeOH and followed by evaporation of solvent to dry. After adding of 6.5 mL MeCN/IPA (3/1) and heating at 75° C., a clear solution was obtained. 2.0 mL solvent was evaporated and stirred overnight. The precipitate was collected by filtration. The cake was washed with heptane, dried at 45° C. under vacuum overnight to give 68 mg (S)-2-amino-3-(4-(2-amino-6-((R)-1-(4-chloro-2-(3-methyl-1H-pyrazol-1-yl)phenyl)-2,2,2-trifluoroethoxy)pyrimidin-4-yl)phenyl)propanoic acid isopropyl sulfate, (54% yield). followed by evaporation of solvent to dry After adding of 6.5 mL MeCN/IPA (3/1) a clear solution was obtained 2.0 mL solvent was evaporated The precipitate was collected by filtration The cake was washed with heptane dried at 45° C. under vacuum overnight