[CH3:1][NH:2][C@H:3]1[CH2:8][CH2:7][C@H:6]([O:9][C:10]2[CH:11]=[C:12]3[C:17](=[CH:18][CH:19]=2)[C:16](=[O:20])[NH:15][CH:14]=[CH:13]3)[CH2:5][CH2:4]1.C=O.[C:23](O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(O)(=O)C.C(#N)C>[CH3:1][N:2]([CH3:23])[C@H:3]1[CH2:8][CH2:7][C@H:6]([O:9][C:10]2[CH:11]=[C:12]3[C:17](=[CH:18][CH:19]=2)[C:16](=[O:20])[NH:15][CH:14]=[CH:13]3)[CH2:5][CH2:4]1A couple of drops of glacial acetic acid were added to a solution of trans-6(4-methylaminocyclohexyloxy)-2H-isoquinolin-1-one (Example 12; 25 mg, 92 μmol) and formaldehyde (40 μL) in acetonitrile (1 ml). The mixture was stirred for 20 minutes and then sodium triacetoxyborohydride (100 mg) was added. The mixture was stirred at ambient temperature for 16 hours then concentrated in vacuo. The residue was partitioned between chloroform/isopropanol (3:1) and aqueous sodium hydrogen carbonate. The organic layer was separated then concentrated to give a residue that was purified by prep-HPLC to give trans-6(4-dimethylaminocyclohexyloxy)-2H-isoquinolin-1-one, EI-MS: m/z=287.3 [M+H]+.
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