Gold-Catalyzed Cascade Reaction of 2‑Alkynyl Aryl Azides with Enecarbamates for Direct Synthesis of α‑(3-Indolyl)ketones

α-(3-Indolyl)­ketones are essential building blocks for the generation of biologically active molecules. We described a new method for the direct assembly of α-(3-indolyl)­ketones through the cascade reaction of 2-alkynyl aryl azides with enecarbamates, in which the in situ generated α-imino gold carbene intermediate was trapped by enecarbamate to achieve umpolung reactivity of indole at the 3-position.