Abstract
A straightforward synthesis of a fluorine-18-labeled prodrug of AFA233 is reported. The key step in the preparation of [18F]AFA233-prodrug is the selective deprotection of the tert-butyl protection groups of the quinoxalinedione moiety without cleavage of the tert-butyl-S-acyl-2-thioethyl protection groups on the phosphate esters. In addition, the preparation of the nonradioactive prodrug reference compound of AFA233 is reported.
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