Synthesis of a Modified Thymidine and Preparation of Precursors of Oligonucleotide Radicals

Abstract
The synthesis of t-butyl thymidyl ketone 13 has been accomplished starting from the substituted thymidine 9. Ketone 13 is a useful building block for the preparation of modified oligonucleotides. Irradiation of oligonucleotide 14a led selectively to cleavage products 15a and 16a.

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