1: zinc / diethyl ether / 14 h / 10 - 30 °C / Inert atmosphere 2: zinc; acetic acid / 1,4-dioxane / 16 h / 0 - 20 °C 3: sodium tetrahydroborate; methanol / 1 h / 0 - 20 °C View Scheme

1: zinc-copper amalgam / ethylene glycol dimethyl ether / 12 h / 0 - 20 °C 2: zinc; ammonium chloride / methanol / 12 h / 20 °C / Cooling with ice View Scheme

1: potassium tert-butylate; Methyltriphenylphosphonium bromide in diethyl ether T=20°C; 1 h; 2: 3-oxo-azetidine-1-carboxylic acid tert-butyl ester in diethyl ether T=35°C; 2 h;

potassium tert-butylate in diethyl ether T=20°C;