Hydrochloric Acid → T-817 maleate

Participants

Reaction Conditions

Reaction Steps

To bis(2-methoxyethyl)ether (5 mL) suspension of 1.00 g of 1-(3-(2-(1-benzothiophen-5-yl)ethoxy)propionyl)azetidin-3-ol was added 0.37 g of sodium borohydride, which was then cooled to 10° C. Thereto was dropwise added 2.46 mL of 4.0 mol/L hydrogen chloride/dioxane at 5 to 15° C. for 12 minutes, which was then stirred at same temperature for 30 minutes, at room temperature for 3 hours and at 35 to 40° C. for 6 hours. After cooling, thereto was dropwise added 3.27 mL of 6.0 mol/L hydrochloric acid, which was then stirred at 65 to 70° C. for 1.5 hours. To the reaction mixture were added water and ethyl acetate, and the pH was adjusted to 10.0 with 2.0 mol/L sodium hydroxide aqueous solution. The organic layer was separated, washed sequentially with water and saturated sodium chloride aqueous solution. Thereto were added anhydrous magnesium sulfate and activated carbon. After insoluble matter was filtered off, the solvent was distilled off under reduced pressure. To the resultant residue was added 0.36 g of maleic acid, which was solidified from a mixed solvent (5 mL) of ethyl acetate:2-propanol (4:1) to provide 0.86 g of 1-(3-(2-(1-benzothiophen-5-yl)ethoxy)propyl)azetidin-3-ol maleate as colorless crystal form.

Provenance & Evidence