[C@@H:1]12[CH2:7][C@@H:4]([CH2:5][CH2:6]1)[C@@H:3]([C:8]([O:10]C)=[O:9])[N:2]2[C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13].CO.[OH-].[Li+]>C1COCC1>[C:15]([O:14][C:12]([N:2]1[C@H:3]([C:8]([OH:10])=[O:9])[C@H:4]2[CH2:7][C@@H:1]1[CH2:6][CH2:5]2)=[O:13])([CH3:18])([CH3:16])[CH3:17]To a solution of (1S,3S,4R)-2-tert-butyl 3-methyl 2-azabicyclo[2.2.1]heptane-2,3-dicarboxylate (1.67 g, 6.54 mmol) in THF:MeOH (41 mL:13 mL) was added aqueous Lithium hydroxide (1M, 8.2 mL, 8.2 mmol) and the reaction was allowed to stir at room temperature overnight. Upon completion, the reaction was concentrated in vacuo, diluted with ethyl acetate and washed with 1N HCl. The aqueous layer was back extracted with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered and concentrated to give (1S,3S,4R)-2-(tert-butoxycarbonyl)-2-azabicyclo[2.2.1]heptane-3-carboxylic acid (1.36 g, 86%). 1H NMR (400 MHz, Methanol-d4) δ 6.43 (s, 1H), 5.84 (s, 1H), 5.74 (d, 1H), 4.34 (s, 1H), 3.36-3.18 (m, 3H), 3.17-3.06 (m, 3H), 3.02 (s, 3H), 2.97 (s, 6H).
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