Among the naturally occurring pseudonucleosides (Cnucleosides),1 a few examples of pyridine C-nucleosides are known. 2 An understanding of the behavior of this structure type is relevant in light of the recently observed antibiotic character of pyridine nucleosides. 3 We report on the synthesis of pyridine C-nucleosides via an application of the thionucleoside photorearrangement. © 1979, American Chemical Society. All rights reserved.