title: A Mild and Regiospecific Synthesis of Pyrazoleboranes.
abstract: Alkynylboranes show unprecedented reactivity in their [4+2] cycloaddition of sydnones offering access to fully substituted pyrazoles within a few hours at room temperature. This method delivers synthetically valuable pyrazoleboranes with complete control of regioselectivity, and these intermediates can be further elaborated through functionalization of the C-B bond.
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK.
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Brown
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK.
authors.forename: Júlia
authors.initials: J
authors.lastname: Comas-Barceló
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK.
authors.forename: Joseph P A
authors.identifier: http://orcid.org/0000-0001-5038-5699
authors.initials: JPA
authors.lastname: Harrity
keywords: alkynylborane; cycloaddition; pyrazole; regioselective; sydnone