期刊
TETRAHEDRON LETTERS
卷 51, 期 27, 页码 3561-3564出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2010.04.132
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资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- University of Alberta
- Alberta Ingenuity Foundation
The concept of boronic acid catalysis (BAC) for the activation of unsaturated carboxylic acids is applied to the Diels-Alder cycloaddition between 2-alkynoic acids as dienophiles and various dienes. These [4+2] cycloadditions produce cyclohexadienyl carboxylic acids, which can be oxidized in situ to produce polysubstituted aromatic carboxylic acids. The boronic acid catalyst is suspected to provide activation by a LUMO-lowering effect of the unsaturated carboxylic acid likely via a covalent, monoacylated hemiboronic ester intermediate. (C) 2010 Elsevier Ltd. All rights reserved.
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