1: 73 percent / cyclohexene, PdO / ethanol / 48 h / Heating 2: 95 percent / concd. NH4OH, pyridine / 48 h / 45 °C View Scheme

Multi-step reaction with 3 steps 1: 93 percent / diethyl ether / 0.5 h / Ambient temperature2: 40 percent / Et3N, phosgene / benzene / 1 h / Heating3: 64 percent / N,N-dimethyl-acetamide / Ambient temperature  

With  cyclohexene; Trimethylene glycol in  ethanol 48 h;  Heating;