Abstract
Using a Mg(II)/(cyclopropyl)indabox catalyst system, non-enolizable α′-hydroxy-α,β-unsaturated ketones can undergo Michael addition under base-free conditions with nitromethane to afford γ-nitroketones in moderate to excellent yield and with good to excellent enantioselectivity. Under the same reaction conditions, Michael acceptors such as N-acryloyloxazolidinones and alkylidene malonate esters showed high conversion, but 0% ee. The main drawbacks of this method are long reaction times (3-11 days) and the need of a large excess of nucleophile (nitromethane is used as solvent).
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