1: 190 °C 2: aq. HCl View Scheme

Multi-step reaction with 2 steps 1: 98 percent / 10percent aq. HCl / tetrahydrofuran / Ambient temperature2: 78 percent / 1.) diisopropylamine, n-BuLi; 2.) 10percent aq. HCl / tetrahydrofuran; hexane / 1.) -78 to rt., 2 h; 2.) 45 min, rt.