How is 4-Benzyl 2-ethyl 2,4-morpholinedicarboxylate (CAS: 1226776-83-5) typically synthesized?

4-Benzyl 2-ethyl 2,4-morpholinedicarboxylate is typically synthesized by the condensation of 2-ethylmorpholine and benzoic acid in the presence of a catalyst like a Lewis acid. The reaction is carried out under mild conditions to ensure high selectivity and yield, with the product being isolated through recrystallization from appropriate solvents.