期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 75, 期 22, 页码 7704-7716出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo101585t
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资金
- CNRS University
- Region Haute-Normandie
- MENRT
- INSA of Rouen
In the present work, enantioselective protonation of silyl enol ethers is reported by means of a variety of chiral nitrogen bases as catalysts, mainly derived from cinchona alkaloids, in the presence of various probe nucleophiles as proton source A detailed study of the most relevant reaction parameters is disclosed allowing high enantioselectivities of up to 92% ee with excellent yields to be achieved under mild and eco-friendly conditions The synthetic utility of this organocatalytic protonation was demonstrated during the preparation of two homoisoflavones 4a and 4b, isolated from Chlorophytum Inornatum and Scilla Nervosa, which were obtained with 81% and 78% ee, respectively
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