Single point binding ruthenium Lewis acid catalysts [Ru (acetone)(S, S)-BIPHOP-F) Cp][SbF6]((S, S)-1b) and [Ru (acetone)(S, S)-BIPHOP-F)(indenyl)][SbF6]((S, S)-1c) efficiently catalyze intramolecular Diels− Alder (IMDA) reactions under mild conditions to afford the