Adenine deoxy ribonucleoside

A nucleoside consists of a purine or pyrimidine base linked to a pentose, either D-ribose to form a ribonucleo-side or 2-deoxy-D-ribose to form a deoxyribonucleoside. Three major purine bases and their corresponding ribo-nucleosides are adenine/adenosine, guanine/guanosine and hypoxanthine/inosine. The three major pyrimidines and their corresponding ribonucleosides are cytosine/ cytodine, uracil/uradine and thymine/thymidine. A nucleotide such as ATP (Fig. 17-1) is a phosphate or polyphosphate ester of a nucleoside. 

Structures of the ribonucleoside that contains adenine, called adenosine (9-p-D-ribofuranosyl adenine left), and the deoxyribo-nucleoside that contains cytosine, called cytidine (l,2 -deoxy-p-o-ribofuranosyl cytosine right). 

Ribonucleosides of 5- and 6-aminoimidazo[4,5-Z>]pyridine have been prepared by conventional methods. The reaction sequence shown in Scheme 2 has been used to prepare 9-(5-deoxy-a-D-arabinofuranosyI)adenine from D-ribose. ... 

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