1: N,N-dimethyl-acetamide / 6 h / Heating 2: 58 percent / 1 N NaOH / ethanol / 48 h / Ambient temperature View Scheme

1: 1.) NaBH4 / 1.) ethanol, 2.) dimethylacetamide, room temperature, 6 h 2: 72 percent / 1 N NaOH / ethanol / 48 h / Ambient temperature View Scheme