C(OC([NH:8][CH:9]1[CH:17]=[CH:16][CH2:15][CH:14]2[CH:10]1[C:11](=O)[NH:12][C:13]2=O)=O)(C)(C)C.[H-].[Al+3].[Li+].[H-].[H-].[H-].O.[OH-].[Na+]>FC(F)(F)C(O)=O.O1CCCC1>[NH2:8][CH:9]1[CH:17]=[CH:16][CH2:15][CH:14]2[CH:10]1[CH2:11][NH:12][CH2:13]213.3 g (50 mmol) of 4-tert.-butyloxycarbonylamino-1,3-dioxo-1,3,3a,4,7,7a-hexahydro-isoindole (from Example Z23, method II) are stirred overnight at room temperature in 166 ml of trifluoroacetic acid. The trifluoroacetic acid is then distilled off at 10 mbar, and the residue is freed from remaining acid in a high vacuum at 50° C. The residue is subsequently taken up in absolute tetrahydrofuran and concentrated in vacuo. The residue is taken up in 100 ml of absolute tetrahydrofuran and the mixture is added dropwise under nitrogen to a solution of 11.3 g (0.3 mol) of lithium aluminium hydride in 300 ml of absolute tetrahydrofuran. The mixture is then refluxed for 16 hours. 11.3 g of water in 34 ml of tetrahydrofuran, 11.3 ml of 10% strength sodium hydroxide solution and 34 ml of water are added dropwise in succession to the cold mixture. The precipitate is filtered off with suction and washed with tetrahydrofuran. The filtrate is concentrated, and the residue is distilled.
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