in pyridine; diethyl ether 2 h; Heating;

1: 77 percent / acetic acid; acetic anhydride / 7 h / Ambient temperature 2: 93 percent / LAH / diethyl ether / 2 h / Heating 3: 95.8 percent / diethyl ether; pyridine / 2 h / Heating View Scheme

1: 93 percent / LAH / diethyl ether / 2 h / Heating 2: 95.8 percent / diethyl ether; pyridine / 2 h / Heating View Scheme

P2O5 in toluene 4 h; Heating;

P2O5 in toluene 4 h; Heating;