1: 95 percent / Et3SiH; TFA / 4 h / 70 °C 2: 76 percent / Na2WO4*2H2O; H2O2 / H2O; methanol / 0.67 h / 0 - 20 °C 3: 48 percent / 5 percent H2SO4 / 24 h / Heating 4: 93 percent / 40 percent aq. NaOH / methanol / 16 h / Heating View Scheme

triethylamine in chloroform T=20°C; 23 h;

1: 94 percent / LiAlH4 / tetrahydrofuran / 4 h / Heating 2: 99 percent / Et3N / CHCl3 / 23 h / 20 °C View Scheme

1: Et3N 2: LiAlH4 3: Et3N View Scheme