Arecaidine propargyl ester (hy

Biotinylation of a Propargylated Cyclic (3′‐5′) Diguanylic Acid and of Its Mono‐6‐Thioated Analog Under “Click” Conditions

?isobutyryl?5??O ?(4,4??dimethoxytrityl)?2??O ?(propargyl)guanosine is converted to its 3??O ?levulinyl ester in a yield of 91%. The reaction of commercial N 2 ?isobutyryl?5??O ?(4,4??dimethoxytrityl)?2??O ?tert ?butyldimethylsilyl?3??O ?[(2?cyanoethyl)?N ,N