Hydrochloric Acid → 1-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylic acid

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Reaction Steps

To a solution of ethyl 1-{N-[(methyloxy)carbonyl]-L-valyl}-8-oxa-1-azaspiro[4.5]decane-2-carboxylate (167) (80 mg, 0.2 mmol) in THF/water/methanol (1.0 mL/0.5 mL/0.5 mL) was added lithium hydroxide monohydrate (13 mg, 0.3 mmol) and the reaction stirred at room temperature for 72 h. The reaction was treated with 1N HCl (0.5 mL) and the reaction partitioned between EtOAc and 0.1 N HCl. The organic layer was separated and dried over MgSO4 and concentrated in vacuo to afford the title compound as a white solid (53 mg, 72% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 12.88 (br. s., 1H) 7.45-7.61 (m, 1H) 4.89-5.03 (m, 1H) 3.70-3.87 (m, 2H) 3.65 (t, J=9.2 Hz, 1H) 3.53 (s, 3H) 3.02 (td, J=12.9, 4.9 Hz, 1H) 2.71-2.90 (m, 1H) 2.22-2.38 (m, 1H) 1.87-2.19 (m, 3H) 1.53-1.73 (m, 1H) 1.32-1.42 (m, 1H) 1.06-1.15 (m, 1H) 0.61-0.98 (m, 8H). LC-MS ESI (M+H)+=342.95.

Provenance & Evidence