Abstract
The solid phase phospite triester synthesis of oligodeoxynucleotides containing cytosine arabinoside (araC) is described. A protected araC phosphoramadite was prepared for the introduction of araC residues at 5'termini and internucleotide positions in DNA oligomers. These oligomers were utilized to demonstrate the formation of correct 3'-5' linkages, to test for alkaline lability at the araC site, and to study the stability of duplexes containing araC-G base pairs. For the introduction of araC residues at 3' terminal positions, a protected derivative of araC was coupled to functionalized silica. This material was used to prepare a test oligomer which was characterized enzymatically.
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