Prodrugs of 9-.beta.-D-arabinofuranosyladenine. 1. Synthesis and evaluation of some 5'-(O-acyl) derivatives

Abstract
A number of 5''-(O-acyl) derivatives of 9-.beta.-D-arabinofuranosyladenine (ara-A, VIRA-A) were prepared by direct acylation of the parent nucleoside 1 in pyridine-N,N-dimethylformamide. These compounds, designed as prodrugs for 1, offer a range of solubilities and lipophilicities indicating for several examples improved solubility and the potential for improved membrane transport over 1. All are resistant to deactivation by adenosine deaminase. Of special interest is the 5''-(O-valeryl) derivative that shows a marked increase in antiviral activity over 1.