1: 75 percent / acetonitrile / 5 h 2: 1.) pyridine, 2.) triethylamine / 1.) chloroform, reflux, 3 h, 2.) toluene, reflux, 1 h View Scheme

pyridine; triethylamine 1.) chloroform, reflux, 3 h, 2.) toluene, reflux, 1 h; Yield given. Multistep reaction;