pyridine; hydrogen fluoride T=24°C; 3 h;

1: 1.) L-Selectride; 2.) 3percent H2O2 / 1.) THF, -78 deg C, 30 min; 2.) THF, -78 deg C 2: 85 percent / acetic acid / tetrahydrofuran; H2O / 1.5 h / 55 °C View Scheme