Various kinds of 5'-O-unsaturated acyl 5-fluorouridines were synthesized to obtain 5-fluorouridine derivatives with low toxicity and high antitumor activity. Antitumor activity of the compounds against L-1210 leukemia in mice was examined, and the 5'-O-4-opentenoyl derivative showed the highest antitumor activity.
<i>p</i>-Methoxybenzyl as a New<i>N</i><sup>3</sup>-Imide Protecting Group of 5-Fluorouridine and Its Application to the Synthesis of 5′-<i>O</i>-Acryloyl-5-fluorouridine
5′-O-Acryloyl-5-fluorouridine was prepared by use of p-methoxybenzyl(PMB) group as a new N3-imide protecting group of 5-fluorouridine. A chemoselective method for protection has been developed by use of ethyldiisopropylamine as a base and deprotection was effected by AlCl3-anisole system.