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0 °C

Under a nitrogen atmosphere a mixture of 9.98 g (50.9 mmol) 2-(5-methoxy-2-nitrophenyl)-ethylamine, 9.80 mL (54.9 mmol) N-benzylpiperidone and 6.30 mL (114 mmol) acetic acid in 270 mL DCM was cooled to 0° C. in an ice bath. At this temperature 14.2 g (67.0 mmol) sodium triacetoxyborohydride were added batchwise within 20 min. The reaction mixture was stirred for a further 4 h at 0° C. and left to warm up to RT overnight. Then the mixture was combined with 400 mL of a 15% (w/v) aqueous potassium carbonate solution and stirred for 1 h at RT. The organic phase was separated off, dried and concentrated by rotary evaporation. 18.8 g of the desired product were obtained.

1. waitleft
2. temperatureto warm up to RT overnight
3. stirringstirred for 1 h at RT
4. customThe organic phase was separated off
5. customdried
6. concentrationconcentrated by rotary evaporation