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The iridium-catalyzed asymmetric hydrogenation of 2-methylindole using monodentate phosphites and amidophosphites as ligands was examined. The use of iodine as the additive resulted in increased enantioselectivity and conversion in the iridium-catalyzed hydrogenation of 2-methylindole. Full conversion and up to 80% ee were obtained with a catalyst based on a phosphite ligand.
A series of chiral phosphite-type ligands has been evaluated in the iridium-catalyzed asymmetric hydrogenation of acyclic arylimines in supercritical CO 2 . High reactivities (100% conversion in 50–120min) and enantioselectivities (up to 95%) were obtained.
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