C(OC([NH:8][CH2:9][C:10]1([C:18]([OH:20])=[O:19])[C:12]2([CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)[CH2:11]1)=O)(C)(C)C.[ClH:21].CCOCC>O1CCOCC1>[ClH:21].[NH2:8][CH2:9][C:10]1([C:18]([OH:20])=[O:19])[C:12]2([CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)[CH2:11]1To a solution of 1-(tert-butoxycarbonylamino-methyl)-spiro[2.5]octane-1-carboxylic acid (200 mg, 0.706 mmol) in 1,4-dioxane (3 mL) was added 4N HCl in 1,4-dioxane (3 mL). The reaction was stirred for 18 hours at room temperature. Ether (20 mL) was added and the precipitate was isolated by vacuum filtration. The solid was dried in a vacuum oven at 48° C. to give 133 mg (86%) of 1-aminomethyl-spiro[2.5]octane-1-carboxylic acid hydrochloride as a white solid: mp 240–242° C.; 1H NMR (300 MHz, D2O) δ 0.92 (d, J=5.2 Hz, 1H), 1.40 (d, J=5.2 Hz, 1H), 1.4–1.6 (m, 10H), 3.12 (d, J=14.0 Hz, 1H), 3.61 (d, J=14.0 Hz, 1H); MS (APCI) m/z 184 [M+H]+. Anal. Calcd. For C10H17NO2—HCl: C, 54.67; H, 8.26; N, 6.38; Cl, 16.14. Found: C, 54.91; H, 8.36; N, 6.25; Cl, 15.99.
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