Hydrochloric Acid → 5-Hydroxy-5-[5-(4-methyl-6-{[4-(trifluoromethyl)pyridin-2-yl]amino}pyridin-2-yl)-1,3-thiazol-2-yl]-5,6,7,8-tetrahydronaphthalene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a suspension of (R)-methyl 5-hydroxy-5-(5-(4-methyl-6-(4-(trifluoromethyl)pyridin-2-ylamino)pyridin-2-yl)thiazol-2-yl)-5,6,7,8-tetrahydronaphthalene-2-carboxylate (12.8 g, 23.68 mmol) in EtOH (192 mL), was added 1N aqueous LiOH (83 mL, 83 mmol). The white suspension was heated to 45° C. for 4 h, during which time the reaction became bright yellow. The reaction was cooled to rt and acidified with 1N aqueous HCl to pH=4 during which time the product precipitated. Filtration afforded (R) 5-Hydroxy-5-[5-(4-methyl-6-{[4-(trifluoromethyl)pyridin-2-yl]amino}pyridin-2-yl)-1,3-thiazol-2-yl]-5,6,7,8-tetrahydronaphthalene-2-carboxylic acid as an off white solid (11.5 g, 92% yield). MS ESI calcd for C26H21F3N4O3S [M+H]+ 527, found 527. 1H NMR (500 MHz, DMSO) δ 12.85 (s, 1H), 10.20 (s, 1H), 8.64 (s, 1H), 8.48 (d, J=5.1 Hz, 1H), 8.23 (s, 1H), 7.72 (s, 1H), 7.66 (d, J=8.1 Hz, 1H), 7.38-7.31 (m, 2H), 7.21 (d, J=4.9 Hz, 1H), 7.10 (s, 1H), 6.60 (s, 1H), 2.92-2.82 (m, 2H), 2.40-2.33 (m, 1H), 2.30 (s, 3H), 2.15-2.08 (m, 1H), 2.03-1.88 (m, 2H) ppm.

Provenance & Evidence