acetic anhydride 2 h; Heating;

1: 63 percent / AlCl3 / CH2Cl2 / 5 h / Ambient temperature 2: 1) hydrazine hydrate, 2) KOH / 1) diethylene glycol, 130 deg C, 1 h, 2) diethylene glycol, 130 deg C, 2 h, then 160 deg C, 3 h 3: 1) TiCl4, 2) hydroxylamine hydrochloride, pyridine / 1) CH2Cl2, 0 deg C, 30 min, 2) ethanol, reflux, 2 h 4: 83 percent / acetic anhydride / 2 h / Heating View Scheme

1: 63 percent / AlCl3 / CH2Cl2 / 5 h / Ambient temperature 2: 1) hydrazine hydrate, 2) KOH / 1) diethylene glycol, 130 deg C, 1 h, 2) diethylene glycol, 130 deg C, 2 h, then 160 deg C, 3 h 3: 1) TiCl4, 2) hydroxylamine hydrochloride, pyridine / 1) CH2Cl2, 0 deg C, 30 min, 2) ethanol, reflux, 2 h 4: 83 percent / acetic anhydride / 2 h / Heating View Scheme

1: 1) TiCl4, 2) hydroxylamine hydrochloride, pyridine / 1) CH2Cl2, 0 deg C, 30 min, 2) ethanol, reflux, 2 h 2: 83 percent / acetic anhydride / 2 h / Heating View Scheme

1: 1) hydrazine hydrate, 2) KOH / 1) diethylene glycol, 130 deg C, 1 h, 2) diethylene glycol, 130 deg C, 2 h, then 160 deg C, 3 h 2: 1) TiCl4, 2) hydroxylamine hydrochloride, pyridine / 1) CH2Cl2, 0 deg C, 30 min, 2) ethanol, reflux, 2 h 3: 83 percent / acetic anhydride / 2 h / Heating View Scheme