title: Modified Shapiro reactions with bismesitylmagnesium as an efficient base reagent.
abstract: Bismesitylmagnesium has been shown to successfully mediate the Shapiro reaction. A range of tosylhydrazones has been subjected to the developed system, which furnishes exceptionally high incorporation of the introduced electrophiles and good yields of the functionalized styrenes. At conveniently accessible temperatures and with a comparably small excess of base reagent, this protocol offers an efficient alternative to the lithium-mediated process. Importantly, 1.05 equiv of Weinreb amides are sufficient to obtain aryl enones in good yields.
authors.affiliation: Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, Scotland, UK. w.kerr@strath.ac.uk
authors.forename: William J
authors.initials: WJ
authors.lastname: Kerr
authors.forename: Angus J
authors.initials: AJ
authors.lastname: Morrison
authors.forename: Marek
authors.initials: M
authors.lastname: Pazicky
authors.forename: Tina
authors.initials: T
authors.lastname: Weber