Journal
TETRAHEDRON
Volume 65, Issue 26, Pages 5056-5061Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2009.02.021
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Funding
- NIGMS [GM080442]
- Eli Lilly
- Boehringer Ingelheim
- Johnson Johnson
- Alfred P. Sloan Foundation
- Monfort Family Foundation
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A highly regioselective rhodium-catalyzed intermolecular [2+2+2] cycloaddition of terminal alkynes with a variety of isocyanates to provide 2- and 4-pyridones has been developed. This reaction proceeds in good to excellent yields and overcomes the problem of dimerization and trimerization through the use of phosphoramidite ligands. A CO migration in the metallacycle is proposed to account for the formation of 4-pyridone. (C) 2009 Elsevier Ltd. All rights reserved.
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