A range of cyclic N-alkyl imines were efficiently hydrogenated by using a chiral cationic Ru(η(6)-cymene)(MsDPEN)(BArF) complex (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) in high yields and up to 98% ee. A one-pot synthesis of chiral 2-phenylpyrrolidine via reductive amination was also developed.
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Chen et al. (2011) studied this question.
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