selenium(IV) oxide in ethyl acetate 18 h; Heating;

Multi-step reaction with 6 steps 1: 70 percent / 10percent NaOH, 30percent H2O2 / 1 h / 100 °C2: 84 percent / POCl3 / 2 h / Heating3: 77 percent / H2, NEt3 / 10percent Pd/C / ethanol / 1 h / 18 °C / 2280 Torr4: 81 percent / 30percent H2O2, conc. HCl / methanol / 0.5 h / Ambient temperature5: diethyl ether / 24 h6: 87 percent / 30percent H2O2, conc. HCl / methanol / 0.5 h / Ambient temperature