1: 4-nitro-1H-indazole With ammonium sulfate; 1,1,1,3,3,3-hexamethyl-disilazane 20 h; Heating; 2: (2R,3R,4R,5S)-4,5-bis(acetyloxy)-2-[(acetyloxy)methyl]tetrahydro-3-furanyl acetate With trimethylsilyl trifluoromethanesulfonate in 1,2-dichloro-ethane T=20°C; Hibert-Johnson glycosylation; 3: With ammonia in methanol T=20°C; Title compound not separated from byproducts;

1.1: hexamethyldisilazane; ammonium sulfate / 20 h / Heating 1.2: 64 percent / TMSOTf / 1,2-dichloro-ethane / 5 h / 20 °C 2.1: 92 percent / NH3 / methanol / 20 °C View Scheme

1.1: hexamethyldisilazane; ammonium sulfate / 20 h / Heating 1.2: 64 percent / TMSOTf / 1,2-dichloro-ethane / 5 h / 20 °C 2.1: 92 percent / NH3 / methanol / 20 °C View Scheme