One-pot synthesis of salicylaldehyde containing biaryl frameworks via an aminocatalytic Diels-Alder-retro-Diels-Alder cascade reaction of ynals with 2-pyrones

Salicylaldehyde containing biaryls are efficiently synthesized via an unprecedented amine promoted Diels-Alderretro-Diels-Alder cascade reaction of ynals with 2-pyrones in good yields.The reaction is instrumentally metalfree,operationally simple and mild,and tolerates a diverse array of functional groups.