Lithium hydroxide, monohydrate → {3-[(S)-3-cyclopentyl-2-(1-oxo-4-trifluoromethyl-1,3-dihydro-isoindol-2-yl)-propionylamino]-pyrazol-1-yl}-acetic acid

Participants

Reaction Steps

A mixture of {3-[(S)-3-cyclopentyl-2-(1-oxo-4-trifluoromethyl-1,3-dihydro-isoindol-2-yl)-propionylamino]-pyrazol-1-yl}-acetic acid tert-butyl ester (133 mg, 0.26 mmol, prepared as in Example 3) and lithium hydroxide monohydrate (22 mg, 0.52 mmol) in tetrahydrofuran:water (1:1, 10 mL) at room temperature was stirred for 2 h. The reaction mixture was then concentrated in vacuo and partitioned between a 1 N aqueous hydrochloric acid solution and ethyl acetate. The organic layer was then dried over magnesium sulfate, filtered to remove the drying agent, and the filtrate concentrated in vacuo to afford {3-[(S)-3-cyclopentyl-2-(1-oxo-4-trifluoromethyl-1,3-dihydro-isoindol-2-yl)-propionylamino]-pyrazol-1-yl}-acetic acid (118 mg, 98%) as a white foam: HR-ES(+) m/e calcd for C22H23N4O4F3 [M+H]+ 465.1744, observed 465.1744; 1H NMR (400 MHz, DMSO-d6) δ ppm 10.93 (s, 1H), 8.01 (dd, J=7.67, 13.00 Hz, 2H), 7.69-7.80 (m, 1H), 7.59 (d, J=2.13 Hz, 1H), 6.45 (d, J=2.13 Hz, 1H), 4.95-5.12 (m, 2H), 4.81 (s, 2H), 4.72 (d, J=17.90 Hz, 1H), 1.09-2.11 (m, 11H).

Provenance & Evidence