tetrabutyl ammonium fluoride in tetrahydrofuran 12 h; Ambient temperature;

1: 94 percent / CH2Cl2 / 0.25 h / Ambient temperature 2: 90 percent / NaI / acetone / 24 h / Ambient temperature 3: 75 percent / CH2Cl2; diethyl ether / 10 h / Ambient temperature View Scheme

in dichloromethane 18 h; Ambient temperature;