Lithium hydroxide, monohydrate → 3-[4-(2,3,4,5-Tetrahydro-benzo[b]azepine-1-carbonyl)-phenyl]-propionic Acid

Lithium hydroxide monohydrate (114 mg, 2.72 mmol) was added to a solution of 3-[4-(2,3,4,5-tetrahydro-benzo[b]azepine-1-carbonyl)-phenyl]-propionic acid methyl ester from Example E65.3 (415 mg, 1.23 mmol) in water (5 ml) and dioxan (20 ml). The mixture was stirred for 18 h at room temperature then concentrated in vacuo. The residue was dissolved in chloroform, washed with 1M HCl solution then brine, dried and concentrated in vacuo to yield the title compound (241 mg, 61%).