The direct utilization of unsaturated sugars in nucleoside syntheses. The synthesis, configuration, and conformation of certain hex-1-enitol-3-yl, hex-2-enopyranosyl-, and hexopyranosylpurines. The preparation of 9-(1,5-anhydro-2,3-dideoxy-D-arabino-hex-1-enitol-3-yl)adenine and 9-(2,3-dideoxy- -D-erythro-hex-2-enopyranosyl)adenine from D-glucal |