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Now accessible: Sterically hindered vicinal tetrasubstituted carbon stereocenters, which are not accessible by asymmetric hydrogenation, were constructed by a catalytic asymmetric CC bond formation (see scheme; Dpp=diphenylphosphinoyl). By changing the Group 2 metal center, stereodivergent access to α,β-tetrasubstituted α,β-diamino esters was realized.
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Lü et al. (2011) studied this question.
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