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Beilstein J. Org. Chem. 2019, 15, 1563–1568, doi:10.3762/bjoc.15.159
Graphical Abstract
Scheme 1: Synthetic approaches to [1,2,4]triazolo[4,3-a]pyridines.
Scheme 2: Synthesis of 3-methylphosphonylated [1,2,4]triazolo[4,3-a]pyridines. Reaction conditions: 1 (1 mmol...
Scheme 3: Synthesis of methylphosphonylated 6(8)-nitro-[1,2,4]triazolo[4,3-a]pyridines and 6(8)-nitro-[1,2,4]...
Scheme 4: Acid-promoted Dimroth rearrangement pathway.
Scheme 5: Synthesis of phosphonylated [1,2,4]triazolo[4,3-a]quinolines and [1,2,4]triazolo[3,4-a]isoquinoline...
Scheme 6: Plausible reaction pathway.