hydrazine in ethanol T=68°C; 10 h;

With  tetrabutyl ammonium fluoride in  tetrahydrofuran T=20°C; 0.5 h;   

Multi-step reaction with 5 steps 1.1: potassium hexamethylsilazane / tetrahydrofuran / 6 h / -78 °C / Inert atmosphere1.2: -78 - 20 °C / Inert atmosphere2.1: sodium hydrogencarbonate; 3-chloro-benzenecarboperoxoic acid / toluene / 2 h / 0 °C / Inert atmosphere2.2: 5 h / 60 °C / Inert atmosphere2.3: 20 °C / Inert atmosphere; Molecular sieve3.1: boron trifluoride diethyl etherate / 75 °C / Inert atmosphere4.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1 h / 150 °C / Inert atmosphere; Microwave irradiation5.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 20 °C / Inert atmosphere  

Multi-step reaction with 4 steps 1.1: sodium hydrogencarbonate; 3-chloro-benzenecarboperoxoic acid / toluene / 2 h / 0 °C / Inert atmosphere1.2: 5 h / 60 °C / Inert atmosphere1.3: 20 °C / Inert atmosphere; Molecular sieve2.1: boron trifluoride diethyl etherate / 75 °C / Inert atmosphere3.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 1 h / 150 °C / Inert atmosphere; Microwave irradiation4.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 20 °C / Inert atmosphere  

Multi-step reaction with 4 steps 1: di-isopropyl azodicarboxylate; triphenylphosphine / tetrahydrofuran / 40 °C / Inert atmosphere2: boron trifluoride diethyl etherate / 75 °C / Inert atmosphere3: pyridine; 4-(N,N-dimethlyamino)pyridine / 1 h / 150 °C / Inert atmosphere; Microwave irradiation4: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 20 °C / Inert atmosphere