The 1‐alkylidenephthalane scaffold is found in several biological active compounds. In order to synthesize 1‐alkylidenephthalanes, a Domino reaction was developed using 2‐alkynyl‐substituted bromobenzenes. Successive bromine/lithium exchange, nucleophilic addition at aldehydes or ketone 5‐exo‐dig cyclization and hydrolysis resulted in aldehydes or esters in high yield. The 5‐exo‐dig cyclization key