[OH:1][CH:2]1[C:11]2[CH:10]=[N:9][CH:8]=[C:7]([C:12]3[CH:19]=[CH:18][C:15]([C:16]#[N:17])=[CH:14][CH:13]=3)[C:6]=2[CH2:5][CH2:4][CH2:3]1.[H-].[Na+].CI.[C:24]([O-])(O)=O.[Na+]>CN(C=O)C>[CH3:24][O:1][CH:2]1[C:11]2[CH:10]=[N:9][CH:8]=[C:7]([C:12]3[CH:13]=[CH:14][C:15]([C:16]#[N:17])=[CH:18][CH:19]=3)[C:6]=2[CH2:5][CH2:4][CH2:3]1
A cooled (0° C.) solution of (rac)-4-(8-hydroxy-5,6,7,8-tetrahydroisoquinolin-4-yl)benzonitrile (example 11) (50 mg, 200 μmol) in DMF (1.4 mL) was treated with NaH (55% in oil, 9.6 mg, 220 μmol) and after ½ h with methyl iodide (13.7 μL, 220 μmol) in DMF (0.2 mL). After stirring 1 h at 0° C. and 1.5 h at room temperature, the reaction mixture was poured on aq. sat. NaHCO3 solution followed by extraction with AcOEt (3×). The organic phases were washed once with aq. sat. NaCl solution. The combined organic phases were dried (Na2SO4), filtered and purified by flash chromatography (50 g SiO2, Telos-cartridge, CH2Cl2/MeOH 1%). Precipitation from CH2Cl2 with n-pentane gave the title compound (17 mg, 32%) as off-white powder. MS: 265.1 (M+H+).
Loading…
