1: 78 percent / NEt3 / CH2Cl2; tetrahydrofuran / 6 h / -78 °C 2: 1.) DBU / 1.) DMF, 40-50 deg C, 40 min, 2.) DMF, 110 deg C, 3 h View Scheme

1,8-diazabicyclo[5.4.0]undec-7-ene 1.) DMF, 40-50 deg C, 40 min, 2.) DMF, 110 deg C, 3 h; Yield given. Multistep reaction;