Trifluoroacetic acid → 2-Fluoro-2-(3-((4-(2-isopropylthiazole-4-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl)methyl)phenyl)acetaldehyde

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A solution of (9-(3-(1-fluoro-2-hydroxyethyl)benzyl)-1-oxa-4,9-diazaspiro[5.5]undecan-4-yl)(2-isopropylthiazol-4-yl)methanone (example 39, step f) (0.213 g) in DCM (5 mL) was cooled in ice-water and treated with trifluoroacetic acid (0.053 mL) and stirred for 5 minutes. Dess-Martin periodinane (0.296 g) was added and the mixture was removed from the cooling bath and stirred at room temperature for 20 minutes. More Dess-Martin periodinane (0.295 g) was added and the mixture was stirred at room temperature for an additional 30 minutes. The reaction was then quenched by the addition of saturated sodium thiosulphate solution (5 mL), saturated sodium bicarbonate solution (5 mL) and ethyl acetate (5 mL), and the resulting two-phase mixture was stirred for 10 minutes. The mixture was then extracted twice with ethyl acetate, and the combined organic extracts washed with brine. Acetic acid (0.1 mL) was added, then the acidified extracts were dried over anhydrous magnesium sulphate and concentrated in vacuo to afford the crude subtitled product as an off-white foam. Yield 0.240 g.

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