[CH3:1][C@H:2]1[NH:7][C@@H:6]([CH3:8])[CH2:5][N:4]([C:9]2[CH:10]=[C:11]([C:15](=[O:17])[CH3:16])[CH:12]=[CH:13][CH:14]=2)[CH2:3]1.[BH-](OC(C)=O)(OC(C)=O)O[C:20](C)=O.[Na+].C=O.[NH4+].[OH-]>C(Cl)Cl.O>[NH4+:4].[OH-:17].[CH3:8][C@H:6]1[N:7]([CH3:20])[C@@H:2]([CH3:1])[CH2:3][N:4]([C:9]2[CH:10]=[C:11]([C:15](=[O:17])[CH3:16])[CH:12]=[CH:13][CH:14]=2)[CH2:5]1A mixture of 1-[3-((3R,5S)-3,5-dimethyl-piperazin-1-yl)-phenyl]-ethanone (226 mg, 0.974 mmol), NaBH(OAc)3 (309 mg, 1.46 mmol) and CH2O (37% water solution, 0.087 ml, 1.17 mmol) in DCM (10 ml) was stirred at room temperature overnight. The resulting solution was diluted with water, brought to basic conditions with NH4OH and extracted with DCM. The organic phase was dried over Na2SO4 and evaporated in vacuo. The crude reaction mixture was purified by SCX cartridge (eluent: MeOH and then 3% NH4OH in MeOH) to give 188 mg of 1-[3-((3R,5S)-3,4,5-trimethyl-piperazin-1-yl)-phenyl]-ethanone.
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