[C:1]([NH:9][CH:10]([N:17]1[CH:21]=[CH:20][N:19]=[CH:18]1)[C:11](=[O:16])[C:12]([CH3:15])([CH3:14])[CH3:13])(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[BH4-].[Na+].O>CO>[C:1]([NH:9][CH:10]([N:17]1[CH:21]=[CH:20][N:19]=[CH:18]1)[CH:11]([OH:16])[C:12]([CH3:15])([CH3:14])[CH3:13])(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Process variant (b) 28.5 g (0.1 mol) of 1-benzamido-3,3-dimethyl-1-(imidazol-1-yl)-butan-2-one of melting point 140°-142° C. (prepared analogously to Example 8, in accordance with process (a)) were dissolved in 250 ml of methanol. 4 g (0.1 mol) of sodium borohydride were added in portions while stirring and cooling at 0° to 10° C. Stirring was continued for 15 hours at room temperature and 200 ml of water were added to the reaction mixture. The mixture was then extracted by shaking with 200 ml of methylene chloride and the organic phase as dried over sodium sulphate and concentrated by distilling off the solvent in vacuo. Boiling up with petroleum ether and a little ether caused the mixture to crystallize. 22.6 g (79% of theory) of 1-benzamido-3,3-dimethyl-1-imidazol-1-yl-butan-2-ol of melting point 143° C. were obtained.
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