Triacetoxyperiodinane → HCID 178481823, compound

Participants

Reaction Steps

To a suspension of 2-[2-(5-tert-butyl-4-chloro-2-methyl-2H-pyrazol-3-yl)-6-(2-trifluoromethyl-phenyl)-3H-imidazo[4,5-c]pyridin-4-yloxy]-ethanol (230 mg, 0.466 mmol, prepared as described in Example 11, STEP F) in DCM (10 mL) at 0° C. was added Dess-Martin periodinane (395 mg, 0.931 mmol). The resulting mixture was warmed to room temperature and stirred for 2 h. The reaction was then quenched by adding aqueous 10% Na2S2O3 solution (20 mL). The resulting mixture was treated with EtOAc (50 mL) and washed with saturated NaHCO3 solution (20 mL), H2O (20 mL) and brine (20 mL). After drying with Na2SO4, the resulting solution was concentrated in vacuo and the residue was purified by flash chromatography on silica gel (20:80-50:50 EtOAc/hexanes) to yield [2-(5-tert-butyl-4-chloro-2-methyl-2H-pyrazol-3-yl)-6-(2-trifluoromethyl-phenyl)-3H-imidazo[4,5-c]pyridin-4-yloxy]-acetaldehyde as a yellow solid. 1H-NMR (400 MHz, CDCl3) δ: 7.67 (dd, J=7.5, 1.9 Hz, 1H), 7.49-7.54 (m, 2H), 7.35-7.44 (m, J=7.3, 7.3, 7.3, 7.3, 1.6 Hz, 2H), 5.07 (t, J=4.9 Hz, 1H), 4.52 (dd, J=4.8, 1.5 Hz, 2H), 4.04 (s, 3H), 1.45 (s, 9H). Mass Spectrum (LCMS, ESI pos.) Calculated For C23H21F3N5O2: 492.1 (M+H), Measured: 492.1.

Provenance & Evidence