Switchable Annulation of 2‐Isocyanophenyl Propargylic Ester and Diethyl 2‐Aminomalonate: Synthesis of Quinoline‐Fused Pyrrole and Benzo[b]azepin‐2(3H)‐One Skeleton

A novel cascade reaction of 2‐isocyanophenyl propargylic ester and diethyl 2‐aminomalonate is developed. The flexibility of this protocol enables the selective synthesis of quinoline‐fused pyrrole and benzo[ b ]azepin‐2( 3H )‐one derivatives in an efficient manner.