title: Regioselective one-step synthesis of pyrazoles from alkynes and N-tosylhydrazones: [3+2] dipolar cycloaddition/[1,5] sigmatropic rearrangement cascade.
authors.affiliation: Instituto Universitario de Química Organometálica Enrique Moles, Universidad de Oviedo, c/Julián Clavería 8, Oviedo, 33006, Spain.
authors.forename: M Carmen
authors.initials: MC
authors.lastname: Pérez-Aguilar
authors.forename: Carlos
authors.initials: C
authors.lastname: Valdés
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D002384:Catalysis; D003300:Copper / Q000737:chemistry; D061565:Cycloaddition Reaction; D006835:Hydrazones / Q000737:chemistry*; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D000480:Alkynes; D006835:Hydrazones; D011720:Pyrazoles; D003300:Copper
keywords: alkyne; heterocycles; hydrazones; rearrangement; synthetic methods