Concise routes to pyrazolo[1,5-a]pyridin-3-yl pyridazin-3-ones

Karen A. Johnston, Robert W. Allcock, Zhong Jiang, Ian D. Collier, Haakon Blakli, Georgina M. Rosair, Patrick D. Bailey, Keith M. Morgan, Yasushi Kohno, David R. Adams

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


Cycloaddition of pyridine N-imine with 6-alkyl-4-oxohex-5-ynoates followed by condensation with hydrazine provides concise access to pharmacologically active 6-(pyrazolo[1,5-a]pyridin-3-yl)pyridazinones. For the first time alkynyl heterocycles are also shown to be effective dipolarophiles for pyridine N-imine, and analogous compounds can be accessed directly in modest yields through the reaction of 6-(alkyn-1-yl)pyridazin-3-one derivatives. © The Royal Society of Chemistry 2008.

Original languageEnglish
Pages (from-to)175-186
Number of pages12
JournalOrganic and Biomolecular Chemistry
Issue number1
Publication statusPublished - 2008


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