[CH2:1]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH2:4][C@@H:3]([CH2:11][OH:12])[NH:2]1.[CH3:13][C:14](OC(C)=O)=[O:15].C([O-])([O-])=O.[K+].[K+].CC(O)=O>CCOC(C)=O.CO>[OH:12][CH2:11][C@@H:3]1[CH2:4][C:5]2[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=2)[CH2:1][N:2]1[C:14](=[O:15])[CH3:13]
To (S)-(1,2,3,4-tetrahydroisoquinolin-3-yl)methanol (Aldrich, 350 mg, 2.14 mmol) in EtOAc (4.3 mL) and MeOH (1.1 mL) was added Ac2O (243 μL, 2.57 mmol). The resulting reaction mixture was stirred at room temperature for 2 h. K2CO3 was then added to neutralize the AcOH, and the reaction mixture was filtered through a pad of CELITE®, washing with EtOAc. The filtrate was concentrated in vacuo to give the title compound (316 mg, 72%) as a white solid. 1H NMR (CDCl3, 1.5:1 mixture of amide rotamers) δ 7.26-7.10 (m, 4H), 5.17 (d, J=18.0 Hz, 0.5H), 4.90 (dt, J=5.1, 9.4 Hz, 0.5H), 4.66-4.44 (m, 1H), 4.39-4.23 (m, 1H), 3.66-3.55 (m, 1H), 3.55-3.45 (m, 1H), 3.14 (dd, J=5.9, 16.3 Hz, 0.5H), 3.02 (dd, J=6.2, 15.8 Hz, 0.5H), 2.92-2.76 (m, 1H), 2.27 (s, 1H), 2.24 (s, 2H); MS(ESI+) m/z 206.1 (M+H)+.
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