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- W2785758502 abstract "The enantioselective H-transfer hydrogenation of quinoline by Hantzsch ester is a relevant example of Brønsted acid catalyzed cascade reactions, with phosphoric acid being a privileged catalyst. The generally accepted mechanism points out the hydride transfer step as the rate- and stereodetermining step, however computations based on these models do not totally fit with experimental observations. We hereby present a computational study that enlightens the stereochemical outcome and quantitatively reproduces the experimental enantiomeric excesses in a series of H-transfer hydrogenations. Our calculations suggest that the high stereocontrol usually attained with BINOL-derived phosphoric acids results mostly from the steric constraints generated by an aryl substituent of the catalyst, which hinders the access of the Hantzsch ester to the catalytic site and enforces approach through a specific way. It relies on a new model involving the preferential assembly of one of the stereomeric complexes formed by the chiral phosphoric acid and the two reaction partners. The stereodetermining step thus occurs prior to the H-transfer step." @default.
- W2785758502 created "2018-02-23" @default.
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- W2785758502 date "2018-02-09" @default.
- W2785758502 modified "2023-10-10" @default.
- W2785758502 title "Revised Theoretical Model on Enantiocontrol in Phosphoric Acid Catalyzed <i>H</i>-Transfer Hydrogenation of Quinoline" @default.
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- W2785758502 doi "https://doi.org/10.1021/acs.joc.7b03248" @default.
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