[C:1]([C:5]1[C:14]2[C:9](=[CH:10][C:11]([O:17][CH3:18])=[C:12]([O:15][CH3:16])[CH:13]=2)[C:8]([CH3:19])=[N:7][C:6]=1[OH:20])([O:3][CH3:4])=[O:2].I[CH2:22][CH3:23]>CN(C)C=O.C(=O)([O-])[O-].[Ag+2]>[C:1]([C:5]1[C:14]2[C:9](=[CH:10][C:11]([O:17][CH3:18])=[C:12]([O:15][CH3:16])[CH:13]=2)[C:8]([CH3:19])=[N:7][C:6]=1[O:20][CH2:22][CH3:23])([O:3][CH3:4])=[O:2]A slurry of 4-carbomethoxy-3-hydroxy-6,7-dimethoxy-1-methylisoquinoline (0.500 g, 1.81 mmol) and silver carbonate (0.498 g, 1.81 mmol) in dimethylformamide (15 mL) was stirred for 20 minutes and then iodoethane (0.326 g, 2.09 mmol) was added and the slurry was stirred at room temperature for two days. The silver iodide precipitate was filtered off and the filtrate was diluted with water (75 mL) and extracted with ether (3×40 mL). The ether was successively washed with water and saturated sodium chloride solution and dried (Na2SO4). The ether was evaporated in vacuo and the solid residue was triturated with ether/hexane to give the title compound (310 mg, 56% as a pale yellow solid, mp 147°-149° C. IR (KBr): 1709, 1629, 1572 cm-1. NMR (CDCl3): δ 1.40 (t, 3H, 4-OCH2CH3), 2.80 (s, 3H, 1-CH3), 3.98 (s, 9H, 6,7-Ar-OCH3 and 4-COOCH3); 4.50 (q, 2H, 4-OCH2CH3); MS: 305 (M+).
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