The synthesis of 5-(azidomethyl)-2'-deoxyuridine (10) has been accomplished by two independent methods. The first involved tosylation of 5-(hydroxymethyl)-2'-deoxyuridine (1) to furnish a mixture of two mono-and a ditosyl nucleosides which were converted into the corresponding 5-(azidomethyl)(lo), 5-(azidomethyl)-5'-azido (14), and 5-(hydroxymethyl)-5'- azido (15) derivatives of 2'-deoxyuridine. The second method was more selective and ...