The present work describes some recent approaches to the syntheses of three classes of locked-North nucleosides: beta-D-ribo-, beta-D-deoxyribo-, and beta-D-dideoxyribonucleosides. The method developed for the latter class permitted access to a novel bicyclo[3.1.0]hexene-type nucleosides structurally similar to D4T and carbovir. A structural analysis and biological activities are discussed.