Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 17, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202200131
Keywords
chiral cyclopropenimine; glycine imine; Michael addition; organosuperbase; alpha,beta-unsaturated isoxazole
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Funding
- National Natural Science Foundation of China [21372259]
- School of Pharmacy at the Fourth Military Medical University
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education
- College of Life Sciences at Northwest University
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A highly efficient asymmetric Michael addition of bulky glycine imine to alpha,beta-unsaturated isoxazoles has been achieved using a chiral cyclopropenimine catalyst, resulting in high yields and stereoselectivities. Solvent choice was found to have a significant effect on the reaction, and gram-scale preparation and transformations of the Michael adducts were accomplished without loss of stereoselectivity.
A highly efficient asymmetric Michael addition of bulky glycine imine to alpha,beta-unsaturated isoxazoles has been achieved by using 5 mol% of chiral cyclopropenimine as a chiral organo-superbase catalyst under mild conditions. Michael adducts were obtained in excellent yields (up to 97%) and stereoselectivities (up to> 99:1 dr and 98% ee). A significant solvent effect was found in these chiral organosuperbase catalyzed asymmetric Michael reactions. Gram-scale preparation of Michael adducts and their transformations are realized to provide corresponding products without loss of stereoselectivities. The configurations of Michael adduct was determined by single-crystal X-ray diffraction analysis.
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