摘要:
Methyl 6-aralkyl-2,5-diketopiperidine-3-carboxylates derived from L-Phe and L-Trp, and their 3-substituted analogues in which the 3-substituent is the side chain of Phe, Asp and Ala have been synthesized. Cycle[Trp-psi(COCH2)Gly] and cycle[Phe-psi(COCH2)-xi-Phe] have been also prepared.