[NH2:1][C:2]1[CH:11]=[CH:10][C:5]2[NH:6][C:7](=[O:9])[O:8][C:4]=2[CH:3]=1.[C:12]1([CH2:18][CH2:19][CH:20]=O)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.CO.[BH4-].[Na+]>C1C=CC=CC=1>[C:12]1([CH2:18][CH2:19][CH2:20][NH:1][C:2]2[CH:11]=[CH:10][C:5]3[NH:6][C:7](=[O:9])[O:8][C:4]=3[CH:3]=2)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1To a suspension of 6-amino-2-benzoxazolone (6.00 g) and molecular sieves 4A (10.0 g) in dry benzene (100 ml) was added 3-phenylpropanal (5.25 ml), and then the mixture was stirred at room temperature for 1 hour. Methanol (150 ml) was combined with this and sodium borohydride (1.50 g) was added in portions at room temperature The reaction mixture was filtered, the filtrate was concentrated and 5% sodium bicarbonate was added. The organic material was extracted with dichloromethane. The dichloromethane phase was separated, washed with brine. Drying and removal of solvent under reduced pressure gave a crude product which was crystallized from hot ethanol to afford 7.07 g of the title compound: mp 129°-130° C.
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