Feasibility study on the reaction of 1,4-diazabicyclo[2.2.2]octane (DABCO) with (L-Serine-L-Serine) and (L-Phenylalanine-L-Serine) diketopiperazines

This paper summarizes the reaction of DABCO with the enol tosylate derivatives made from (L-Ser-L-Ser) and (L-Phe-L-Ser) diketopiperazines (DKP’s). The reaction between DABCO and EE-di-tosylate (L-Ser-L-Ser) DKP (2), results in the isomerization of the serine di-tosylate from EE-2 to ZZ-2.