reactions of chloro ( alkoxycarbonyl ) methylenetriphenylphosphoranes with protected d-ribofuranoses resulted in the exclusive formation of c-beta-d-ribofuranosyl glycosides , which were converted to some c-nucleosides , such as showdomycin and pyrido- [ 1,2-a ] pyrimidine c-nucleosides .
C0017977
glycosides
C0028621
nucleosides