pyridine in chloroform 2 h;

1: 1.) potassium iodide, 2.) potassium carbonate / 1.) butanone, 18 h, 2.) butanone, reflux, 1.5 h 2: 87 percent / lithium tetrahydroaluminate / diethyl ether / 2 h / Heating 3: 43 percent / pyridine / CHCl3 / 2 h View Scheme

1: 87 percent / lithium tetrahydroaluminate / diethyl ether / 2 h / Heating 2: 43 percent / pyridine / CHCl3 / 2 h View Scheme