1.1: p-TsOH; MeOH / CH2Cl2 / 8 h / 20 °C 2.1: pyridine / diethyl ether; tetrahydrofuran / 4 h / Heating 2.2: H2O; pyridine / diethyl ether; tetrahydrofuran / 1 h 3.1: CHCl3; propan-2-ol; various solvent(s) / 5 h / 65 °C View Scheme

methanol; boron trifluoride in dichloromethane 4 h; Ambient temperature;

With  sodium hydride Alkylation;