5'-O-Acyl-5-fluorouridines and 5'-O-acyl-5-sluorocytidines are prepared by the direct acylation of the 5'-hydroxyl group with amino acids under Mitsunobu conditions and the amino acyl derivatives are coupled with other amino acids or peptides to provide antibacterial and antifungal derivatives of the nucleosides. For example, 5-fluorouridine is acylated at the 5'-hydroxyl group with an amino protected L-valine and the acylation product is deprotected to provide 5'-O-(L-valinyl)-5-fluorouridine having activity against Gram-positive bacteria including resistant staphylococcus. Preferred peptide derivatives comprise the tripeptides of ornithine and lysine wherein the terminal amino group is substituted by both hydroxy and acetyl. The latter peptides inhibit the growth of C. albicans.
5'-O-酰基-5-
氟尿
嘧啶和5'-O-酰基-5-
氟胞苷是通过在Mitsunobu条件下直接酰化5'-羟基基团与
氨基酸反应制备的,然后将
氨酰基衍
生物与其他
氨基酸或肽耦合以提供核苷的抗菌和抗真菌衍
生物。例如,5-
氟尿
嘧啶在5'-羟基基团上与
氨基保护的
L-缬氨酸酰化,然后去保护以提供对革兰氏阳性细菌具有活性的5'-O-(L-缬
氨酰基)-5-
氟尿
嘧啶。首选的肽衍
生物包括
鸟氨酸和赖
氨酸的三肽,其中末端
氨基团被羟基和乙酰基取代。后一种肽抑制白色念珠菌的生长。