tetrabutyl ammonium fluoride in tetrahydrofuran 1.) 14h, 25 deg C 2.) 12h, reflux;

1: 91 percent / NaH / tetrahydrofuran / 1h, reflux -> 25 deg C, 24h 2: 31 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 1.) 14h, 25 deg C 2.) 12h, reflux View Scheme

1: CsF / acetonitrile / 24 h / 25 °C 2: 31 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 1.) 14h, 25 deg C 2.) 12h, reflux View Scheme