ChemInform Abstract: Synthesis of 4- and 5-(s-Triazolo[4,3-b]pyridazinyl-3)-substituted Cyclic Polyols

4(R)-(6-Chloro-s-triazolo[4,3-b]pyridazinyl-3)-1,4-furanoses 10 and 11, 5(R)-(6-chloro-s-triazolo[4,3-b]pyridazinyl-3)-1,5-pyranose 13, and 2(S),3(R)-dihydro-5-(6-chloro-s-triazolo[4,3-b]pyridazinyl-3)-2,3-O-isopropylidenefuran (12) were prepared by cyclization of hydrazones 6–9 obtained from 6-chloro-3-hydrazinopyridazine (1) and aldofuranoses 2, 3 and 4, and aldopyranose 5.