The Ru(II)-catalyzed C-H activation and annulation reaction of salicylaldehydes and disubstitutedalkynes affords chromones in high yields. This reaction works with terminal alkynes also and tolerates wide range of sensitive...
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 i...