[CH3:1][O:2][C:3]1[CH:20]=[C:19]([O:21][CH3:22])[CH:18]=[CH:17][C:4]=1[CH2:5][NH:6][C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[C:12](=[O:16])[O:11][CH2:10]2.C=O.[C:25]([BH3-])#N.[Na+].CC(O)=O>C(#N)C>[CH3:1][O:2][C:3]1[CH:20]=[C:19]([O:21][CH3:22])[CH:18]=[CH:17][C:4]=1[CH2:5][N:6]([CH3:25])[C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[C:12](=[O:16])[O:11][CH2:10]2
To a stirred suspension of 5-(2,4-dimethoxy-benzylamino)-3H-isobenzofuran-1-one (18.0 g, 60 mmol) in acetonitrile (200 ml), was added 37% formaldehyde aqueous solution (44.7 ml, 600 mmol) and sodium cyanoborohydride (8.31 g, 132 mmol). The mixture was cooled to 0° C., followed by addition of 10% AcOH aqueous solution (150 ml). The mixture was stirred from 0° C. to room temperature during 2.5 hour period. The resulting solid was filtered, washed with acetonitrile and dried under vacuum to give 5-[(2,4-dimethoxy-benzyl)-methyl-amino]-3H-isobenzofuran-1-one as off-white powder (15.3 g, 81%).
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