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The synthesis of a modified 2'-deoxycytidine-3'-O-phosphoramidite carrying an N-t-butylbenzoyl protected biotin on a long polar spacer arm attached to the 4-N position is described. The presence of the bulky lipophilic t-butylbenzoyl protecting group enables the direct solid phase synthesis of biotinylated oligoribonucleotides and a variety of analogues in high yield without modification of the biotin moiety. Biotinylated antisense oligonucleotides incorporating this new derivative allow convenient isolation and purification of ribonucleic acid-protein complexes. The kinetics of biotin binding to streptavidin agarose is facilitated by the long polar spacer arm.

A protected biotin containing deoxycytidine building block for solid phase synthesis of biotinylated oligonucleotides