ChemInform Abstract: Synthesis of C‐Nucleoside Analogues of 2′,3′‐Dideoxycytidine (I), 3′‐Azido‐2′,3′‐dideoxyuridine (CS‐87) (II), and 2′,3′‐Dideoxy‐2′,3′‐didehydrocytidine (III).