C([O:3][C:4]([C@@H:6]1[CH2:11][CH2:10][O:9][CH2:8][C@H:7]1[NH:12][C@@H:13]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[CH3:14])=[O:5])C.[OH-].[Na+].Cl>O1CCCC1>[C:15]1([C@H:13]([NH:12][C@H:7]2[C@H:6]([C:4]([OH:5])=[O:3])[CH2:11][CH2:10][O:9][CH2:8]2)[CH3:14])[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1A solution of (3S,4R)-3-[(R)-1-Phenyl-ethylamino]-tetrahydro-pyran-4-carboxylic acid ethyl ester (726 mg, 2.6 mmol) in tetrahydrofuran (6 mL) was treated with 1.0 M sodium hydroxide solution (5.2 mL, 5.2 mmol) and the heterogeneous mixture was stirred at room temperature. After 16 h , the now homogeneous solution was treated with 1.0 M hydrochloric acid (5.2 mL, 5.2 mmol) and concentrated in vacuo. The residue was dissolved in water and lyophilized to provide the product, along with sodium chloride, as a fluffy white solid (943 mg, quantitative), used without further purification. 1H NMR (300 mHz, CDCl3) δ7.41 (m, 5H), 4.09 (q, J=6.6 Hz, 1H), 3.98 (dd, J=11.7, 4.0 Hz, 1H), 3.77 (m, 1H), 3.33 (m, 1H), 3.08 (m, 2H), 2.37 (m, 1H), 2.19 (m, 1H), 1.79 (m, 1H), 1.61 (d, J=6.6 Hz, 3H), ESI MS: (M+H)+=250.3 (100%).
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