1: 2-hydroxypyrimidine hydrochloride With ammonium sulfate; 1,1,1,3,3,3-hexamethyl-disilazane 4 h; Inert atmosphereReflux; 2: (2R,3R,4R,5S)-4,5-bis(acetyloxy)-2-[(acetyloxy)methyl]tetrahydro-3-furanyl acetate With tin(IV) chloride in dichloromethane T=20°C; 16 h;

methanol; ammonia