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2. Asymmetric Pt(II)-catalyzed ene reactions: counterion-dependent additive and diphosphine electronic effects

Author

J H, Koh, A O, Larsen, and M R, Gagné

Subjects
Anions, Ions, Models, Chemical, Phenol, Phosphines, Ligands, Platinum
Abstract

[reaction: see text]. Catalysis of the glyoxylate-ene reaction by dicationic P2Pt(II) complexes is subject to anion-dependent additive effects. For [((S)-MeOBiphep)Pt](OTf)2 catalysts, acidic phenols such as 3-CF3-C6H3OH or C6F5OH provide substantial rate increases but do not affect the more active SbF6-based catalysts. Enantioselectivity and reactivity also increased with diphosphine basicity, with 4-t-Bu-substituted MeOBiphep ligands yielding the highest enantioselectivities.

Published
2001

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