Lithium hydroxide, monohydrate → (5-{3-[2-propyl-4-(4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)phenoxy]propoxy}-1H-indol-1-yl)acetic acid

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Reaction Steps

To a solution of methyl (5-{3-[2-propyl-4-(4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)phenoxy]propoxy}-1H-indol-1-yl)acetate (Example 55, 145 mg, 0.28 mmol) in THF (4.8 mL), was added LiOH.H2O (39 mg, 0.84 mmol) in water (1.6 mL), and the mixture was stirred for 12 h at rt. The solvents were evaporated and a small volume of water was added to the residue. The pH of the mixture was adjusted to 3 with 1N HCl. The aqueous layer was extracted with ethyl acetate. The combined organic layers were dried, filtered, and concentrated to give 140 mg (99%) of the product as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.30 (d, 1H), 7.25-7.15 (m, 3H), 7.10 (d, 1H), 6.92 (dd, 1H), 6.45 (d, 1H), 6.20 (d, 1H), 4.85 (s, 2H), 4.40-4.32 (m, 2H), 4.32-4.22 (m, 2H), 2.90-2.80 (br, 2H), 2.80-2.70 (br, 2H), 2.50-2.40 (m, 2H), 2.25-2.05 (m, 2H), 1.95-1.75 (br, 4H), 1.60-1.40 (m, 2H), 0.90 (t, 3H). LC/MS m/z 505.2 (M+H)+, RT 3.88 min.

Provenance & Evidence