期刊
ASIAN JOURNAL OF ORGANIC CHEMISTRY
卷 11, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ajoc.202100649
关键词
enantioselectivity; oxa-Michael addition; electrophilic thiocyanation; flavanones
资金
- NSFC [21971013]
An efficient bifunctional cinchona alkaloids-catalyzed asymmetric tandem intramolecular oxa-Michael addition/electrophilic thiocyanation method was developed for the synthesis of chiral alpha-thiocyanato flavanones with two vicinal stereocenters. The method produced the desired compounds in good yields with excellent diastereo- and enantioselectivities under mild conditions, demonstrating its potential for scale-up.
An efficient bifunctional cinchona alkaloids-catalyzed asymmetric tandem intramolecular oxa-Michael addition/electrophilic thiocyanation of alkylidene beta-ketoesters with N-thiocyanatosuccinimide (NTS) was developed. A series of chiral alpha-thiocyanato flavanones containing two vicinal stereocenters including an all-carbon quaternary center were prepared in good yields with excellent diastereo- and enantioselectivities (up to 97% ee) under mild conditions, and a successful scale up preparation of our protocol was also demonstrated.
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