Transition‐Metal‐Catalyzed Hydroamination and Carboamination Reactions of Anthranilic Allenamides as a Route to 2‐Vinyl‐ and 2‐(α‐Styryl)quinazolin‐4‐one Derivatives

2-Vinyl- and 2-(α-styryl)quinazolin-4-ones have been synthesized by intramolecular gold-catalyzed hydroamination and palladium-catalyzed carboamination of anthranilic allenamides, easily prepared by prototropic isomerization of the corresponding propargylamides. These procedures, which lead to N-Boc-protected quinazolinones, represent a more flexible alternative to the reported palladium-catalyzedamination of anthranilic allylamides, achievable only from N-tosylallylamides.