Chemical syntheses of 2'-O-(allyloxycarbonyl)methyladenosine, 2'-O-(methoxycarbonyl)methyladenosine and 2'-O-(2,3-dibenzoyloxy)propyluridine 3'-2-cyanoethyl-N,N-diisopropyl phosphoramidite building blocks are described. These monomers were used successfully to incorporate carboxylic acid, 1,2-diol and aldehyde functionalities into synthetic oligonucleotides.
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