hydrogenchloride in ethyl acetate 1.) 0 deg C, 15 min, 2.) RT, 30 min;

Multi-step reaction with 3 steps 1: 74.8 percent / aq. NaOH / toluene / 21 h / 0 - 20 °C2: 1.) LiH / 1.) hexane, 2.) hexane, 60 deg C, 25 h3: 39.6 percent / HMPA / 72 h / Ambient temperature