Cationic Lewis acid complexes [Sc(pyridyl-bis(oxazolinyl)](Cl(2))SbF(6) 1a and 1b catalyze aldol reactions with ethyl glyoxylate with enantioselectivities ranging from 90 to 99% ee and syn reaction diastereoselections ranging from 90:10 to 95:5. [reaction: see text]
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Evans et al. (2002) studied this question.
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