[BH4-].[Li+].[CH2:3]([O:10][C:11]1[CH:12]=[CH:13][C:14]([C:22](=[O:25])[CH2:23][Cl:24])=[C:15]2[C:20]=1[NH:19][C:18](=[O:21])[CH:17]=[CH:16]2)[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.ClCCl.O>C1COCC1>[CH2:3]([O:10][C:11]1[CH:12]=[CH:13][C:14]([CH:22]([OH:25])[CH2:23][Cl:24])=[C:15]2[C:20]=1[NH:19][C:18](=[O:21])[CH:17]=[CH:16]2)[C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1238 mL of a 2 molar solution of lithium borohydride in THF are added dropwise to 52 g (159 mmol) 8-benzyloxy-5-(2-chloro-acetyl)-1H-quinolin-2-one in 650 mL THF at 0° C. It is stirred for two hours at 0° C., then heated to ambient temperature, combined with 200 mL dichloromethane and 75 mL water and stirred for a further hour. The precipitated solid is suction filtered and the organic phase of the filtrate is separated off and freed from the solvent. The residue is combined with the solid from the preceding filtration and repeatedly stirred with diethyl ether and THF. Yield: 51.6 g (99%); mass spectroscopy [M+H]+=330/32.
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