1: 60 percent / thiourea / dimethylformamide / 1.5 h / 21 °C 2: NaBH4 / 10percent Pd/C / methanol 3: 60 percent / sodium perborate, trifluoroacetic acid / 24 h / Heating View Scheme

1: NaBH4 / 10percent Pd/C / methanol 2: 60 percent / sodium perborate, trifluoroacetic acid / 24 h / Heating View Scheme

NaBO3; trifluoroacetic acid 24 h; Heating;