Lithium Hydroxide → ((1S)-5-{3-[2-propoxy-4-(4,5,6,7-tetrahydro-1,3-benzoxazol-2-yl)phenoxy]propoxy}-2,3-dihydro-1H-inden-1-yl)acetic acid

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Reaction Steps

To a solution of ethyl ((1S)-5-{3-[2-propoxy-4-(4,5,6,7-tetrahydro-1,3-benzthiazol-2-yl)phenoxy]propoxy}-2,3-dihydro-1H-inden-1-yl)acetate (Example 166, 88.0 mg, 0.160 mmol) in THF/Water/Methanol (1:2:1) was added solid lithium hydroxide (38.4 mg, 1.60 mmol). The solution was stirred at rt for 3 h, and the solvent was then removed under reduced pressure. The residue was diluted with water and acidified using HCl (2 N aqueous solution) upon which a white precipitate formed. The solid was isolated by filtration to provide the title compound (43.5 mg, 52%) that did not require further purification. 1H NMR (400 MHz, DMSO-d6) δ 7.37 (d, 1H), 7.32 (dd, 1H), 7.07 (d, 1H), 7.04 (d, 1H), 6.78 (s, 1H), 6.69 (dd, 1H), 4.15 (t, 2H), 4.11 (t, 2H), 3.96 (t, 2H), 3.33 (m, 1H), 2.61-2.85 (m, 7H), 2.2-2.30 (m, 3H), 2.11-2.19 (m, 2H), 1.58-1.84 (m, 7H), 0.98 (t, 3H); LC-MS: RT3.80 min, (M+H)+ 22.3.

Provenance & Evidence