Highly enantioselective rhodium-catalyzed addition of arylboroxines to N-phosphinoylaldimines was realized by the steric tuning of a diphenylphosphorus moiety to a di(o-tolyl)phosphorus moiety of a chiral amidomonophosphane. The presence of MS 4 A in a 5:1 solvent mixture of dioxane-propanol was essential to afford the corresponding diarylmethylamines in high yield.
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Hao et al. (2009) studied this question.
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