How is 1-(5-Phenyl-3-pyridinyl)-1,4-diazepane (CAS: 223796-38-1) typically synthesized?

1-(5-Phenyl-3-pyridinyl)-1,4-diazepane is typically synthesized through a multistep process involving the reaction of 5-phenyl-3-pyridinone with morpholine. The key steps include the condensation of the pyridone with morpholine followed by amination to form the diazepane ring. This process often requires mild basic conditions and is carried out with high selectivity and yield, typically over 90%.