The structure of 2',3'-didehydro-2',3'-dideoxynucleosides (d4Ns) was applied to design the novel bioisosteric 4'-seleno-d4Ns as potential inhibitors of human immunodeficiency virus reverse transcriptase (HIV RT). Conversion of 2',3'-dihydroxyl groups of 4'-selenoribofuranosyl pyrimidines into the olefin was accomplished by treatment of cyclic 2',3'-thiocarbonate with 1,3-dimethyl-2-phenyl-1,3,2-diazaphospholidine.
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