We describe the synthesis of benzyl (6S)-1, 3-dichloro-4-oxo-4, 6, 7, 8-tetrahydro-pyrrolo [1, 2-a] pyrazine-6-carboxylic ester, a new conformationally constrained peptidomimetic derivative. This compound is prepared in seven steps from (S)-pyroglutamic acid as starting material.
