[H-].[Al+3].[Li+].[H-].[H-].[H-].[CH2:7]([N:14]1[C:21](=O)[CH:20]2[CH:16]([N:17]([CH3:23])[CH2:18][CH2:19]2)[C:15]1=O)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.O.[OH-].[K+]>O1CCCC1>[CH2:7]([N:14]1[CH2:21][CH:20]2[CH:16]([N:17]([CH3:23])[CH2:18][CH2:19]2)[CH2:15]1)[C:8]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=11.52 g (40 mmol) of lithium aluminum hydride are initially introduced into 30 ml of anhydrous tetrahydrofuran, and 4.9 g (20 mmol) of 5-benzyl-4,6-dioxo-1-methyl-octahydropyrrolo[3,4-b]pyrrole are added dropwise as a solution in 15 ml of anhydrous tetrahydrofuran. The mixture is then subsequently stirred at the boiling point for 3 hours. 1.5 ml of water, 1.5 ml of 15% strength potassium hydroxide solution and 4.5 ml of water are added dropwise in succession to the batch and the precipitate is then filtered off with suction and washed with tetrahydrofuran. The filtrate is concentrated on a rotary evaporator and the residue is distilled. 3.1 g (72% of theory) of a colorless distillate of boiling point 80° C./0.07 mbar are obtained.
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