Hydrochloric Acid → 6-[(2-{[(3R)-3-methoxypyrrolidin-1-yl]carbonyl}thieno[3,2-b]pyridin-7-yl)oxy]-2-methylbenzo[b]thiophene-3-carboxylic acid

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Reaction Steps

To a solution of methyl 6-[(2-{[(3R)-3-methoxypyrrolidin-1-yl]carbonyl}thieno[3,2-b]pyridin-7-yl)oxy]-2-methylbenzo[b]thiophene-3-carboxylate 1:1b (258 mg, 0.535 mmole) in a mixture of THF/MeOH/H2O (3:2:1, 6 ml) was added LiOH.H2O (224 mg, 5.35 mmole). The reaction was stirred 24 hours at ambient temperature. The mixture was diluted with H2O (10 ml) and acidified to pH 1 with 1 M HCl. The precipitate was collected by vacuum filtration, rinsed with MeOH, and dried at 50° C. under vacuum to afford 116 mg (45%) of a pale brown solid. 1H NMR (DMSO-d6) δ8.58 (1H, d, J=5.4 Hz), 8.44 (1H, d, J=8.9 Hz), 8.07 (1H, s), 8.00 (1H, d, J=24 Hz), 7.39 (1H, dd, J=2.4, 8.9 Hz), 6.78 (1H, d, J=5.4 Hz), 4.10-3.81 (3H, m), 3.69-3.54 (4H. m), 3.27, 3.24 (3H, s), 2.81 (3H, s).

Provenance & Evidence