Celite; sodium acetate; pyridinium chlorochromate in dichloromethane 5 h;

1: 92 percent / piperidine, glacial acetic acid / CHCl3 / 14 h / Heating 2: 90 percent / sodium borohydride / ethanol / 0.67 h / 15 - 20 °C 3: 55 percent / Cu, pyridine / methanol / 36 h / Heating 4: 88 percent / lithium aluminium hydride / diethyl ether / Heating 5: 92 percent / pydidinum chlorochromate, celite, sodium acetate / CH2Cl2 / 5 h View Scheme

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1: 96 percent / diethyl ether; tetrahydrofuran / -60 °C 2: 95 percent / MnO2 / CHCl3 / 72 h / Ambient temperature 3: 97 percent / potassium t-butoxide / diethyl ether / 16 h / 1.) ether, 16 h 4: 87 percent / NaCl, water / dimethylsulfoxide / 10 h / 150 °C 5: 98 percent / potassium t-butoxide / diethyl ether / 0.5 h / 0 °C View Scheme