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Hooray aza-Henry! A combination of zinc triflate, an amine base, and (−)-N-methylephedrine (NME), which can be easily recovered and reused, leads to high enantioselectivities in the aza-Henry reaction of N-Boc-protected aldimines and nitromethane (see scheme; Boc=tert-butyloxycarbonyl).
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Palomo et al. (2005) studied this question.
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