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Electronic properties of the ligands switch the diastereoselectivity in the Cu-catalyzed 1,3-dipolar cycloaddition of azomethine ylides to nitroalkenes: exo- or endo-pyrrolidines were obtained with high diastereo- and enantioselectivities in the presence of different chiral (phosphanylferrocenyl)oxazoline ligands (e.g. 3 a, b).
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Yan et al. (2006) studied this question.
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