tetrabutyl ammonium fluoride in various solvent(s) 2 h; from 0 deg C to room temperature;

1: 2 h / Ambient temperature 2: 1.) LDA; 3.) 5percent hydrochloric acid / 1.) ether, -78 deg C, 0.5 h; 2.) -78 deg C to room temp. 3.) room temp., 2 h View Scheme

1: 2 h / Ambient temperature 2: 1.) LDA; 3.) 5percent hydrochloric acid / 1.) ether, -78 deg C, 0.5 h; 2.) -78 deg C to room temp. 3.) room temp., 2 h View Scheme