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Umpoled oxime source: N‐Nitromethylphthalimide is an excellent hydroxymetanimidoyl anion equivalent; under iminium catalysis and optimized reaction conditions, it undergoes a clean and highly enantioselective Michael addition to enals (see scheme). The nitro(phthalimido)methyl moiety can be then directly converted into an oxime moiety by a simple and high‐yielding protocol.
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