Tetrabutylammonium Fluoride → 3-[(1S)-2-hydroxy-1-methylethoxy]-5-[4-(methylsulfonyl)phenoxy]-N-1,3-thiazol-2-ylbenzamide

Participants

Reaction Steps

Tetra-n-butyl ammonium fluoride (1.0M in THF, 0.832 mL, 0.832 mmol) was added to a solution of 3-((1S)-2-{[tert-Butyl(dimethyl)silyl]oxy}-1-methylethoxy)-5-[4-(methylsulfonyl)phenoxy]-N-1,3-thiazol-2-ylbenzamide (425 mg, 0.756 mmol) in THF (5 mL) and the reaction stirred for 1.5 h. A further portion of tetra-n-butyl ammonium fluoride (0.83 mL) in THF was added and the reaction was stirred for a further 1.5 h. The reaction was then diluted with diethyl ether (40 mL) and 1M aqueous hydrochloric acid (20 mL) and the aqueous layer was re-extracted with diethyl ether (20 mL). The combined organic layers were dried (MgSO4), filtered and evaporated. Purification by column chromatography, eluting with 50% to 100% ethyl acetate in hexanes, afforded the title compound as a foam (200 mg, 60%). 1H NMR δ (CDCl3): 1.30 (d, 3H), 3.08 (s, 3H), 3.77 (m, 2H), 4.47 (m, 1H), 6.85 (s, 1H), 7.00 (d, 1H), 7.13 (d, 2H), 7.20 (s, 1H), 7.32 (d, 1H), 7.37 (s, 1H), 7.92 (d, 2H). m/z 467 (M−H)−

Provenance & Evidence