Regiospecific construction of m-alkenyl benzaldehyde from β-bromoenal and vinyl borate

Herein, we report a Pd-catalyzed regiospecific cycloaromatization of β-bromoenal and vinyl borate esters to synthesize m-alkenyl substituted benzaldehydes. This allows the construction of complex molecules from simple materials, which may be useful in the search for new optical materials.