title: Synthesis of 2-substituted pyrazolo[1,5-a]pyridines through cascade direct alkenylation/cyclization reactions.
abstract: The synthesis of 2-substituted pyrazolo[1,5-a]pyridines from N-iminopyridinium ylides is described. These medicinally interesting compounds are formed through a cascade process involving a palladium-catalyzed direct alkenylation reaction followed by silver-mediated cyclization. The reaction can be performed with a wide range of electron-poor and electron-rich alkenyl iodides in good yields. This work represents perhaps the most direct route for the preparation of these compounds.
authors.affiliation: Department of Chemistry, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Quebec, Canada H3C 3J7.
authors.forename: James J
authors.initials: JJ
authors.lastname: Mousseau
authors.forename: Angélique
authors.initials: A
authors.lastname: Fortier
authors.forename: André B
authors.initials: AB
authors.lastname: Charette
mesh_terms: D000475:Alkenes / Q000138:chemical synthesis* / Q000737:chemistry*; D002384:Catalysis; D020650:Combinatorial Chemistry Techniques; D003500:Cyclization; D015394:Molecular Structure; D010165:Palladium / Q000737:chemistry*; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry*; D012834:Silver / Q000737:chemistry
chemical_list: D000475:Alkenes; D011720:Pyrazoles; D011725:Pyridines; D012834:Silver; D010165:Palladium