sodium borohydride in ethanol

1: CH2Cl2 / 3 h / Ambient temperature 2: pyridine, DMAP, Et3N / CH2Cl2 / 16 h / Ambient temperature 3: 96 percent / CF3COOH / CH2Cl2 / 20 h / Ambient temperature View Scheme

Yield given. Multistep reaction;