Useful Enantioselective Bicyclization Reactions Using an N-Protonated Chiral Oxazaborolidine as Catalyst
作者:Gang Zhou、Qi-Ying Hu、E. J. Corey
DOI:10.1021/ol035542a
日期:2003.10.1
[reaction: see text] Nine examples are reported of enantioselective [4 + 2] cycloaddition reactions of achiral, acyclic substrates to form chiral bicyclo[4.3.0]nonane or bicyclo[4.4.0]decane derivatives.
IntramolecularDiels-Alderreaction of 2-methyl-(E,E)-2,7,9-decatrienal catalyzed by chiral acyloxyborane complex proceeds with high stereo and enantioselectivities.
Chiral Ruthenium Lewis Acid Catalyzed Intramolecular Diels−Alder Reactions
作者:Sirinporn Thamapipol、Gérald Bernardinelli、Céline Besnard、E. Peter Kündig
DOI:10.1021/ol1019103
日期:2010.12.17
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 intramolecularDiels−Alder (IMDA) reactions under mild conditions to afford the endo cycloaddition products as the major product in excellent yields with high diastereo- and enantioselectivities.