Hydrochloric Acid → Fluprostenol

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A solution of (8aR,9R,10R,11aS,Z)-10-hydroxy-9-((R,E)-3-hydroxy-4-(3-(trifluoromethyl)phenoxy) but-1-en-1-yl)-4,5,8,8a,9,10,11,11a-octahydrocyclopenta[b]oxecin-2(3H)-one (3.0 g from Example 8) in 2-propanol (25 mL) was treated with 3N potassium hydroxide aqueous solution (6.8 mL). This mixture was stirred at 50° C. for 2 hr. The reaction mixture was cooled and further adjusted with 3N hydrochloric acid aqueous solution to a pH of 8.5±0.2, and most of the solvent was removed under reduced pressure. The residue was diluted with saturated aqueous solution of sodium bicarbonate (20 mL) and ethyl acetate (20 mL). The mixture was stirred at room temperature for 5 minutes. The organic phase and the aqueous phase were separately collected. The aqueous layer was adjusted to a pH of 3.0±0.2 with 3N hydrochloric acid aqueous solution at room temperature and extracted with ethyl acetate (100 mL). The organic layer was dried over magnesium sulfate and concentrated under reduced pressure to give 3.3 g of crude Travoprost acid.

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