Abstract
The bridged dinucleoside 1-(N6-deoxyadenyl) 2-(O4-thymidyl)-ethane was prepared from the nucleophilic substitution of a O4-triazo-lyl thymidine by a N6-(2-hydroxyethyl) deoxyadenosine derivative via the corresponding 6-halogeno hypoxanthine in ribose and deoxyribose series.