Synthesis of coumarin–nucleoside conjugates via Huisgen 1,3-dipolar cycloaddition

An efficient synthesis of fluorescent coumarin–nucleoside conjugates via Cu(I) catalysed Huisgen 1,3-dipolar cycloaddition is described. Starting from azidonucleosides and coumarin derivatives, products are obtained in good yields. The fluorescent properties of the newly prepared coumarin–nucleoside conjugates are determined.