[CH3:1][N:2]1[O:9][CH2:8][CH:7]2[CH:3]1[CH2:4][N:5]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[CH2:6]2>C(O)C.[Pd]>[OH:9][CH2:8][CH:7]1[CH2:6][N:5]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[CH2:4][CH:3]1[NH:2][CH3:1]10 g (50 mmol) of ethyl 2-methyl-3-oxa-2,7-diazabicyclo[3.3.0]octane-7-carboxylate (Example H d)) are hydrogenated in 200 ml of ethanol on 3 g of Pd-on-active charcoal (10% of Pd) at 50° C. under 50 bar. The catalyst is filtered off, the filtrate is concentrated and the residue is distilled.
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