sodium acetate; pyridinium chlorochromate in dichloromethane 1 h; Ambient temperature;

With  tetrabutyl ammonium fluoride in  tetrahydrofuran 0.166667 h;   

Multi-step reaction with 2 steps 1: 1.) sodium borohydride, 2.) potassium carbonate / 1.) EtOH, 5 min, 2.) reflux, 24 h2: 99.5 percent / tetrabutylammonium fluoride / tetrahydrofuran / 0.17 h