C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].[NH2:15][C:16]1[CH:17]=[C:18]2[C:22](=[CH:23][CH:24]=1)[C:21](=[O:25])[N:20]([CH2:26][CH3:27])[CH2:19]2.[Cl:28][C:29]1[CH:36]=[CH:35][C:32]([CH:33]=O)=[CH:31][CH:30]=1.C(O)(=O)C>C(#N)C>[Cl:28][C:29]1[CH:36]=[CH:35][C:32]([CH2:33][NH:15][C:16]2[CH:17]=[C:18]3[C:22](=[CH:23][CH:24]=2)[C:21](=[O:25])[N:20]([CH2:26][CH3:27])[CH2:19]3)=[CH:31][CH:30]=1Sodium triacetoxyborohydride (1.28 g, 6.10 mmol) was added to a stirred solution of 5-amino-2-ethyl-2,3-dihydro-isoindol-1-one (540 mg, 3.05 mmol), 4-chlorobenzaldehyde (854 mg, 6.10 mmol) and acetic acid (183 μl, 3.05 mmol) in anhydrous acetonitrile (12 ml) at room temperature. The reaction was stirred overnight and quenched with the addition of water. The organic phase was separated, washed with brine, then dried (MgSO4) and evaporated in vacuo. The resulting residue was purified by flash column chromatography (0 to 20% ethyl acetate in dichloromethane) to yield the title compound as a light brown solid (148 mg, 16%). HPLC retention time 4.23 min. Mass spectrum (ES+) m/z 301 (M+H).
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