Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 6, Pages 2333-2337Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201913896
Keywords
alcohols; heterocycles; kinetic resolution; organocatalysis; reaction mechanisms
Categories
Funding
- NSFC [21702138]
- Thousand Talents Plan Youth program
- ShanghaiTech University
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An efficient method for the asymmetric synthesis of 4H-3,1-benzoxazines was developed by kinetic resolution of 2-amido benzyl alcohols using chiral phosphoric acid catalyzed intramolecular cyclizations. A broad range of benzyl alcohols (both secondary and tertiary alcohols) were kinetically resolved with high selectivities, with an s factor of up to 94. Mechanistic studies were performed to elucidate the mechanism of these reactions, wherein the amide moieties reacted as the electrophiles. Gram-scale reaction and facile transformations of the chiral products demonstrate the potential of this method in asymmetric synthesis of biologically active chiral heterocycles.
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