A series of N-acyl derivatives of 5-fluorouracil (5-FU) bearing residues of palmitic, p-myristoylaminobenzoic, p-oleoylaminobenzoic, and 1-adamantanecarbonic acids was synthesized. Relative rates of hydrolysis of derivatives mentioned under physiological conditions, at pH 7.2 and 37 degrees C, have shown that stability of these compounds increases with reducing of spatial accessibility of amide group at N1 in 5-FU. These substances incorporate easily into lipid bilayer; their liposomal preparations showed substantial cytostatic activity on HBL (human breast lymphoma) cells and are of interest as potential antitumor preparations. Also, a fluorescent analog, 1-[8-(3-perylenyl)octanoyl]-5-fluorouracil, destined for studies of the 5-FU derivatives behavior in cells and tissues was prepared.
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