pyridine; 4-(N,N-dimethlyamino)pyridine; thionyl chloride 1.) CH2Cl2, room temperature, 1 min, 2.) CH2Cl2, room temperature, 20 min; Yield given. Multistep reaction;

pyridine; thionyl chloride; 1,8-diazabicyclo[5.4.0]undec-7-ene 1.) CH2Cl2, room temperature, 1 min, 2.) CH2Cl2, room temperature, 20 min; Yield given. Multistep reaction;