Abstract: To test the design and initiate the development of a new class of boron-containing purine nucleoside and aglycon analogs, the benzo-fused boron heterocycles 1-hydroxy-1 H- 2, 4, 1-benzoxazaborine (2), 1, 2-dihydro-l-hydroxy-2, 4, 1-benzodiazaborine (3), and 3- amino-1, 2-dihydro-l-hydroxy-2, 4, l-benzodiazaborine (4) were synthesized, and their structural properties and chemical reactivities were investigated. The heterocyclic ...