Journal
ORGANIC LETTERS
Volume 7, Issue 15, Pages 3195-3197Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol050902a
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Highly enantioselective Michael addition of diethyl malonate to chalcone derivatives has been achieved under mild phase-transfer conditions by the successful utilization of N-spiro C-2-symmetric chiral quaternary ammonium bromide 1 as a catalyst, which possesses diarylhydroxymethyl functionalities as a recognition site for the prochiral electrophile. This simple asymmetric Michael addition process was found to be quite effective for various chalcone derivatives, including those with heteroaromatic substituents.
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