Chemistry Letters, Vol.39, No.8, 896-897, 2010
Nickel-catalyzed [4+2] Cycloaddition of Alkynes to Carbonylsalicylamides via Elimination of Isocyanates
An intermolecular nickel-catalyzed [4 + 2] cycloaddition has been developed where carbonylsalicylamides react with alkynes to afford substituted chromones. The reaction involves an elimination of isocyanates and an addition of alkynes, that is, a formal substitution reaction of an isocyanate by an alkyne.