Cl.[Br:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]([N:11]2[CH2:18][CH:17]3[CH:13]([CH2:14][NH:15][CH2:16]3)[CH2:12]2)=[O:10])=[CH:5][CH:4]=1.C(N(C(C)C)C(C)C)C.[C:28](Cl)(=[O:31])[CH2:29][CH3:30]>C(Cl)Cl>[Br:2][C:3]1[CH:4]=[CH:5][C:6]([C:9]([N:11]2[CH2:12][CH:13]3[CH2:14][N:15]([C:28](=[O:31])[CH2:29][CH3:30])[CH2:16][CH:17]3[CH2:18]2)=[O:10])=[CH:7][CH:8]=11.3 (4-Bromo-phenyl)-(hexahydro-pyrrolo[3,4-c]pyrrol-2-yl)-methanone hydrochloride (300 mg; 0.9 mmol) is dissolved in 5 ml of DCM, N-ethyldiiso-propylamine for synthesis (0.46 ml; 2.7 mmol) is added and then cooled to 0° C. Propionyl chloride for synthesis (0.095 ml; 1.09 mmol) is added dropwise followed by stirring at RT for 14 h. The reaction mixture is separated between DCM and water. The organic layer is separated, dried over MgSO4, filtered off and then reduced to dryness under vacuo to afford 316 mg (99.5%) 1-[5-(4-bromo-benzoyl)-hexahydro-pyrrolo[3,4-c]pyrrol-2-yl]-propan-1-one 3 as a brown oil.
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