The title reagents undergo cyclocondensation reactions with the amidine-like moiety of tri-0- acetyladenosine and cytidine (and related compounds) to form a new five-membered ring (etheno bridging), substituted with a (tert-butoxycarbony1) amino or an ethoxy function. Some of the products exhibit useful fluorescence properties. Removal of the tert- butoxycarbonyl group with standard conditions gives the corresponding, somewhat ...
