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

Participants

Reaction Steps

A solution of (9-(2-chloro-3-(2-hydroxyethyl)benzyl)-1-oxa-4,9-diazaspiro[5.5]undecan-4-yl)(2-isopropylthiazol-4-yl)methanone (example 80, step e) (0.386 g) in DCM (5 mL) was cooled in ice-water, treated with trifluoroacetic acid (0.125 mL) and stirred for 5 minutes. Dess-Martin periodinane (0.519 g) was added, then the mixture was removed from the cooling bath and stirred at room temperature for 35 minutes. The solution was diluted with saturated sodium thiosulphate solution (5 mL), saturated sodium bicarbonate solution (5 mL) and ethyl acetate (5 mL) and the resulting mixture was stirred vigorously for 10 minutes. The mixture was then extracted twice with ethyl acetate, the combined organic phases were washed with brine, acidified with acetic acid (0.1 mL), dried over anhydrous magnesium sulphate and concentrated in vacuo to give the crude subtitled compound as a pale yellow gum. Yield 0.494 g.

Provenance & Evidence