Phosphoric Acid → 4-tert-butoxy-2-(5-isoquinolinyl)-4-oxobutanoic Acid

참여 물질

반응 단계

4-Tert-butyl 1-ethyl 2-(5-isoquinolinyl)succinate (1.00 g, 3.04 mmol) and LiOH (0.29 g) were stirred in MeOH:H2O (3:1, 20 mL) at room temperature for 5 hours. The solution was poured into aqueous H3PO4 (0.1M, 30 mL) and extracted with CHCl3:IPA (3:1, 30 mL×3). The extracts were combined, dried (MgSO4), filtered, and the filtrate was concentrated under reduced pressure to provide the title compound. MS (ESI+) m/z 302 (M+H)+; MS (ESI−) m/z 300 (M−H)−; 1H NMR (DMSO, 300 MHz) δ 1.28 (s, 9H), 2.74 (dd, J1 16.7, J2 6.1, 1H), 3.10 (dd, J1 9.5, J2 6.1, 1H), 4.68 (dd, J1 16.7, J2 9.5, 1H), 7.70 (m, 2H), 8.05 (m, 2H), 8.57 (d, J 6.1, 1H), 9.33 (s, 1H); Anal. Calcd for C17H19NO4+1.25 H2O: C, 63.05; H, 6.69. Found: C, 63.27; H, 6.95.

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