1: hydrazine hydrate / methanol / 4 h / 25 °C / Reflux 2: sodium hydrogencarbonate / ethyl acetate; water / 1.17 h / pH 8 View Scheme

hydrazine in tetrahydrofuran; water Reflux;

1: hydrazine hydrate / methanol / 4 h / 25 °C / Reflux 2: sodium hydrogencarbonate / ethyl acetate; water / 1.17 h / pH 8 3: water; lithium hydroxide hydrate / tetrahydrofuran / 4 h / 25 - 50 °C 4: dimethylsulfide borane complex / tetrahydrofuran / 2 h / 25 °C View Scheme

1: hydrazine hydrate / methanol / 4 h / 25 °C / Reflux 2: sodium hydrogencarbonate / ethyl acetate; water / 1.17 h / pH 8 3: water; lithium hydroxide hydrate / tetrahydrofuran / 4 h / 25 - 50 °C View Scheme

1: hydrazine hydrate / methanol / 4 h / 25 °C / Reflux 2: sodium hydrogencarbonate / ethyl acetate; water / 1.17 h / pH 8 3: water; lithium hydroxide hydrate / tetrahydrofuran / 4 h / 25 - 50 °C 4: dimethylsulfide borane complex / tetrahydrofuran / 2 h / 25 °C 5: sodium acetate; pyridinium chlorochromate / dichloromethane / 6 h / 25 °C View Scheme

in N,N-dimethyl-formamide T=85°C; 12 h;

1: N-bromosuccinmide / 2,2'-azo-bisisobutyronitrile / tetrachloromethane / 3 h / 25 °C / Reflux 2: thionyl chloride / 1 h / 25 °C / Reflux 3: N,N-dimethyl-formamide / 12 h / 85 °C View Scheme

1: thionyl chloride / 1 h / 25 °C / Reflux 2: N,N-dimethyl-formamide / 12 h / 85 °C View Scheme