1: 1M aq. LiOH / tetrahydrofuran / 23 h / Ambient temperature 2: 91 percent / Et3N, DMAP / CH2Cl2 / 0.75 h / Ambient temperature 3: 74 percent / 1M aq. LiOH / tetrahydrofuran / 19 h / Ambient temperature View Scheme

lithium hydroxide in tetrahydrofuran 23 h; Ambient temperature;