The synthesis of a series of 2,3-seconucleoside analogues related to nucleosides previously shown to possess anti-HIV activity is described. Using strategies to distinguish between the three primary hydroxyl groups of a 2,3-seconucleoside, 3-azido-2,3-dideoxy-2,3-secothymidine and 2,3-dideoxy-2,3- secothymidine have been prepared. These compounds, several of the intermediates in their synthesis, as well as O22-anhydro-3-azido-3-deoxy-2,3-secothymidine and several 2,3-secouridine analogues have been tested for their ability to prevent infection of cells by HIV. None showed any significant toxicity or antiviral activity. © 1990.