Methanol → HCID 59632259, compound

Participants

Reaction Steps

To a solution of (E)-methyl 3-(4-(1-(2,6-dichlorophenyl)-3-(2-hydroxypropan-2-yl)-1H-pyrazol-5-yl)-3-methylstyryl)benzoate (180 mg of impure material from previous step, 0.35 mmol) in THF (2.0 mL) was added H2O (0.4 mL) followed by lithium hydroxide monohydrate (25.3 mg, 0.6 mmol). After stirring for 1 hour at ambient temperature a biphasic mixture had formed, and LC/MS analysis of the reaction showed no reaction. a small amount of MeOH was added to homogenize the mixture, and the reaction was then heated to 50° C. in an oil bath. After 2 hours stirring at 50° C., LC/MS analysis showed the reaction to be complete. Heating was discontinued, and after stirring at ambient temperature overnight, the reaction was quenched by the addition of 5% aqueous citric acid, and EtOAc. The layers were separated and the aqueous was extracted with EtOAc (3×). Combined organic extracts were washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure to afford a clear film. This material was purified by reverse phase preparative HPLC eluting with a gradient of MeCN/H2O with 0.05% TFA. The major peak from the HPLC was concentrated under reduced pressure to remove most of the solvents, and the resulting acidic aqueous was extracted with CH2Cl2 (3×). The combined organic extracts were washed with H2O until the washings were no longer acidic (2×), dried over Na2SO4, filtered, and concentrated under reduced pressure to afford (E)-3-(4-(1-(2,6-dichlorophenyl)-3-(2-hydroxypropan-2-yl)-1H-pyrazol-5-yl)-3-methylstyryl)benzoic acid (45.4 mg, 26% yield) as a white powder. 1H NMR (400 MHz CDCl3): δ 821 (1H, s), 7.98 (1H, d, 7.69 (1H, d), 7.45 (1H, t), 7.39 (1H, d), 7.37-7.31 (2H, m), 7.23 (1H, m), 7.15 (1H, m), 7.12-7.07 (2H, m), 7.06 (1H, m), 6.46 (1H, s), 2.45 (3H, s), 1.71 (6H, s). MS(ES): 529 [M+H]+.

Provenance & Evidence