Synthesis of 2-Chloro-2’-5’-dideoxy-5’-difluoromethylphosphinyladenosine: A Nonhydrolyzable Isosteric, Isopolar Analog of 2-Chlorodeoxyadenosine Monophosphate - Levy, Stuart G; Wasson, D Bruce; Carson, Dennis A; Cottam, Howard B (Synthesis, 1996)