The Lewis acid TiCl4 allows the intermolecular hydroamination of vinylarenes (see scheme). Some of the hydroamination products undergo rearrangements to give ortho‐alkylated compounds. The catalyst tolerates a range of functional groups (R′=CF3, Cl, CN, F, Br) and provides the products in good yields. This method was also applied to the synthesis of a tetrahydroisoquinoline derivative.