Abstract
Automated incorporation of haptens at the 3' or 5' end of oligonucleotides required the preparation of the corresponding hapten phosphoramidites. The requisite 1,3-diol framework was prepared in two steps from a carboxylic acid precursor first by a two-carbon homologation using Meldrum's acid to form the corresponding 3-oxo ester and then subsequent reduction to the diol. The primary alcohol was protected with a dimethoxytrityl group, while the secondary alcohol was converted to the reactive phosphoramidite.
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