A syntheses of three new muramyl dipeptide (MDP) analogues related to LK 423 as potential immunomodulators are presented. The dipeptide part of the lead compound was modified by introducing a phosphonamide isostere instead of the amide bond between Lalanine and D-glutamic acid (or D-isoglutamine), yielding new MDP analogues 5 and 9. Furthermore, the amide bond between L-Ala and D-Glu was replaced by a phosphonate isostere, giving peptidyl phosphonate 14. The scope and limitations of the synthetic strategies employed are discussed.
本文介绍了三种与LK 423相关的新型肽聚糖二肽(MDP)类似物,作为潜在的免疫调节剂。通过用
磷酰胺异构体替代
L-丙氨酸和
D-谷氨酸(或D-异谷
氨酸)之间的酰胺键,修改了主要化合物的二肽部分,得到新的MDP类似物5和9。此外,
L-丙氨酸和
D-谷氨酸之间的酰胺键被
磷酸酯异构体替代,生成了肽
磷酸酯14。讨论了所采用合成策略的范围和局限性。