The kinetics of 3'-azido-3'-deoxythymidine phosphorylation with [32P]orthophosphoric acid was studied in the presence of various coupling agents. The most effective method with the use of BrCN provided the isolation of the target 3'-azido-3'-deoxythymidine 5'-[32P]monophosphate in 46% yield and a high specific radioactivity (>100 Ci/mmol).
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