F[B-](F)(F)F.N1(O[C:16](N(C)C)=[N+:17](C)[CH3:18])C2C=CC=CC=2N=N1.[CH2:23]([O:30][C:31]([N:33]1[CH2:42][CH2:41][C:40]2[C:35](=[CH:36][C:37]([O:43][C:44]3[CH:49]=[CH:48][C:47]([C:50]([OH:52])=O)=[CH:46][CH:45]=3)=[CH:38][CH:39]=2)[CH2:34]1)=[O:32])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.CNC.CN1CCOCC1>O1CCCC1>[CH2:23]([O:30][C:31]([N:33]1[CH2:42][CH2:41][C:40]2[C:35](=[CH:36][C:37]([O:43][C:44]3[CH:49]=[CH:48][C:47]([C:50](=[O:52])[N:17]([CH3:18])[CH3:16])=[CH:46][CH:45]=3)=[CH:38][CH:39]=2)[CH2:34]1)=[O:32])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=12-(1H-Benzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (0.44 g) is added to a solution of 7-(4-carboxy-phenoxy)-3,4-dihydro-1H-isoquinoline-2-carboxylic acid benzyl ester, dimethylamine (2 mol/L in tetrahydrofuran, 0.68 mL), and N-methyl-morpholine (0.41 mL) in tetrahydrofuran (20 mL) chilled in an ice bath. The cooling bath is removed and the resulting mixture is stirred at room temperature for 3 h. Then another portion of dimethylamine (2 mol/L in tetrahydrofuran, 0.70 mL) and 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (0.20 g) are added and the mixture is further stirred for another 4 h. After adding another portion of dimethylamine (2 mol/L in tetrahydrofuran, 0.30 mL), the mixture ist stirred at room temperature overnight. The mixture is concentrated and the residue is purified by chromatography on silica gel (ethyl acetate) to furnish the title compound.
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