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Two synthetic pathways towards 4′‐C‐acylthymidines are presented. These modified mononucleosides are precursors of the 2′‐deoxyribonucleotide 4′‐C‐radical. They were converted into their corresponding 3′‐O‐[(2‐cyanoethyl) N,N‐diisopropylphosphoramidites] 3a–c and incorporated in oligonucleotides by solid‐phase synthesis. The structure of some modified nucleosides was revealed by X‐ray crystal‐structure analysis.
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Marx et al. (1996) studied this question.
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