[OH:1][C:2]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:3]=1[CH2:4][CH2:5][NH:6][C:7]2=[O:12].C(=O)([O-])[O-].[Cs+].[Cs+].[CH2:19](Br)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1>C(O)C>[C:20]1([CH2:19][O:1][C:2]2[CH:11]=[CH:10][CH:9]=[C:8]3[C:3]=2[CH2:4][CH2:5][NH:6][C:7]3=[O:12])[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1To a mixture of 2.4 g (14.7 mmol) of 3,4-dihydro-5-hydroxy-1(2H)-isoquinolinone and 2.5 g of cesium carbonate in 30 ml of ethanol was added 2.5 g (15.0 mmol) of benzyl bromide. The mixture was stirred for 18 hours at room temperature. Then an additional 2.5 g of cesium carbonate and 2.5 g of benzyl bromide was added and the mixture was heated under reflux conditions for four hours. The reaction was partitioned between water and ether, the ether layer was filtered (to remove solid), dried (MgSO4), and concentrated. The residue was dissolved in hexane, filtered, concentrated, and the residue was crystallized from ethanol to give 3.01 g (81%) of the desired product; mp 171°-173°.
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