[CH2:1]([O:8][C:9]1[CH:19]=[CH:18][C:17]([CH:20]=[CH2:21])=[CH:16][C:10]=1[C:11]([N:13]([CH3:15])[CH3:14])=[O:12])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C12BC(CCC1)CCC2.[OH-:31].[Na+].OO>O1CCCC1.O>[CH2:1]([O:8][C:9]1[CH:19]=[CH:18][C:17]([CH2:20][CH2:21][OH:31])=[CH:16][C:10]=1[C:11]([N:13]([CH3:15])[CH3:14])=[O:12])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1
To a stirred solution of 2-benzyloxy-N,N-dimethyl-5-vinylbenzamide (560 mg) in tetrahydrofuran (5 ml) was added dropwise a solution of 9-borabicyclo[3.3.1]nonane (255 mg) in tetrahydrofuran (8 ml) at −20° C. under an argon atmosphere, and the mixture was stirred for 14.5 hours at room temperature. To the stirred reaction mixture were added 2N aqueous sodium hydroxide solution (3.0 ml) and 30% aqueous hydrogen peroxide solution (2.4 ml) under ice-cooling, and the resulting mixture was stirred for 5 hours at room temperature. To the reaction mixture was added water, and the resulting mixture was extracted with dichloromethane. The extract was washed with brine and dried over anhydrous magnesium sulfate. After the solvent was removed under reduced pressure, purification of the residue by flash column chromatography on silica gel (eluent:hexane/diethyl ether/dichloromethane=1/2/2 and methanol/diethyl ether/dichloromethane=1/10/10) gave 2-benzyloxy-5-(2-hydroxyethyl)-N,N-dimethylbenzamide (300 mg).
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