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Chiral Ruthenium Lewis Acid Catalyzed Intramolecular Diels−Alder Reactions

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journal contribution
posted on 17.12.2010, 00:00 by Sirinporn Thamapipol, Gérald Bernardinelli, Céline Besnard, E. Peter Kündig
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 endo cycloaddition products as the major product in excellent yields with high diastereo- and enantioselectivities.