Hydrochloric Acid → (S)-2-(tert-butoxy)-2-(5-(4-(4-fluorophenethoxy)phenyl)-2,6-dimethyl-4-(4-(trifluoromethyl)piperidin-1-yl)pyridin-3-yl)acetic acid

Participants

Reaction Conditions

Reaction Steps

The 0.23 mL of 1M sodium hydroxide (9.3 mg, 0.23 mmol) was added to a solution (S)-isopropyl 2-(tert-butoxy)-2-(5-(4-(4-fluorophenethoxy)phenyl)-2,6-dimethyl-4-(4-(trifluoromethyl)piperidin-1-yl)pyridin-3-yl)acetate (50 mg, 0.078 mmol) in ethanol (1 mL) and stirred for 24 h at 90° C. An additional 0.23 mL sodium hydroxide was added and the reaction was continued for 24 h. The reaction mixture was neutralized with 1N HCl solution, extracted with EtOAc, and the organic layer was washed with brine, and dried (MgSO4). The crude material was purified by prep to afford (S)-2-(tert-butoxy)-2-(5-(4-(4-fluorophenethoxy)phenyl)-2,6-dimethyl-4-(4-(trifluoromethyl)piperidin-1-yl)pyridin-3-yl)acetic acid 42 mg (89%) as a mixture of diastereomers. 1H NMR (500 MHz, DMSO-d6) δ 7.41-7.38 (m, 2H), 7.21-7.20 (m, 1H), 7.14 (t, J=8.8 Hz, 2H), 7.0 (d, J=8.4 Hz, 2H), 6.95 (d, J=7.7 Hz, 1H), 5.54 (br. s, 1H), 4.23 (t, J=6.7 Hz, 2H), 3.96-3.94 (m, 2H), 3.07 (t, J=6.6 Hz, 2H), 2.90/2.74 (s, 2H), 2.46 (s, 3H), 2.55 (br. s, 1H), 2.03 (s, 3H), 1.72-1.61 (m, 3H), 1.56-1.54 (m, 1H), 1.10 (s, 9H). UPLC (M+H)=603.5.

Provenance & Evidence