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A gram-scale organocatalytic enantioselective Michael addition of α-nitrocyclohexanone to acrolein has been developed, and it was successfully applied to a concise two-step synthesis of (1S)-azaspiro[4.5]decan-6-one, a useful chiral building block for the synthesis of a variety of natural alkaloids.
A target-oriented highly enantioselective multifunctional organocatalytic approach has been developed to construct the bicycle-[3.3.1]nona-2,6-dien-9-one core of (−)-huperzine A for the first time, with up to 95% ee in the gram-scale procedure. The newly established methodology is also eligible to synthesize a variety of bicyclo[3.3.1]nona-2,6-dien-9-ones in high enantiopurities, and thus is useful...
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