tetrabutyl ammonium fluoride in tetrahydrofuran 1.) -10 deg C, 2.) ice bath-cooling, 5 h; other salts of var. nucleophiles as reagents;

pyridine; diethylamino-sulfur trifluoride in dichloromethane Ambient temperature;

1: 77 percent / pyridine; CH2Cl2 / 2 h / -15 °C 2: 76 percent / Tetra-n-butylammonium fluoride (TBAF) / tetrahydrofuran / 1.) -10 deg C, 2.) ice bath-cooling, 5 h; other salts of var. nucleophiles as reagents View Scheme

lithium bromide in N,N,N',N',N'',N''-hexamethylphosphoric triamide; dimethyl sulfoxide 48 h;

sodium iodide in N,N,N',N',N'',N''-hexamethylphosphoric triamide; dimethyl sulfoxide 48 h;

lithium chloride in N,N,N',N',N'',N''-hexamethylphosphoric triamide; dimethyl sulfoxide 48 h;