How is Dibenzyl (iminodi-2,1-ethanediyl)biscarbamate (CAS: 160256-75-7) typically synthesized?

Dibenzyl (iminodi-2,1-ethanediyl)biscarbamate is typically synthesized via the reaction of diethyl carbonate with 1,3-bis(benzylamino)propane. The process involves the formation of a carbamate intermediate, which is then purified to yield the final product. The reaction is carried out under mild conditions, and the use of a mild base like triethylamine can enhance the yield and selectivity.